ChangeLog

------------------
Pylint's ChangeLog
------------------

What's New in Pylint 2.5.0?
===========================

Release date: TBA

* Can read config from a setup.cfg or pyproject.toml file.

  Close #617


What's New in Pylint 2.4.3?
===========================

Release date: TBA

* Fix an issue with ``unnecessary-comprehension`` in comprehensions with additional repacking of elements.

  Close #3148


* ``import-outside-toplevel`` is emitted for ``ImportFrom`` nodes as well.

  Close #3175

* Do not emit ``no-method-argument`` for functions using positional only args.

  Close #3161


What's New in Pylint 2.4.2?
===========================

Release date: 2019-09-30


* ``ignored-modules`` can skip submodules. Close #3135

* ``self-assigning-variable`` skips class level assignments.

   Close #2930

* ``consider-using-sys-exit`` is exempted when `exit()` is imported from `sys`

   Close #3145

* Exempt annotated assignments without variable from ``class-variable-slots-conflict``

  Close #3141

* Fix ``utils.is_error`` to account for functions returning early.

  This fixes a false negative with ``unused-variable`` which was no longer triggered
  when a function raised an exception as the last instruction, but the body of the function
  still had unused variables.

  Close #3028


What's New in Pylint 2.4.1?
===========================

Release date: 2019-09-25


* Exempt type checking definitions defined in both clauses of a type checking guard

  Close #3127


* Exempt type checking definitions inside the type check guard

  In a7f236528bb3758886b97285a56f3f9ce5b13a99 we added basic support
  for emitting `used-before-assignment` if a variable was only defined
  inside a type checking guard (using `TYPE_CHECKING` variable from `typing`)
  Unfortunately that missed the case of using those type checking imports
  inside the guard itself, which triggered spurious used-before-assignment errors.

  Close #3119

* Require astroid >= 2.3 to avoid any compatibility issues.


What's New in Pylint 2.4.0?
===========================

Release date: 2019-09-24

* New check: ``import-outside-toplevel``

  This check warns when modules are imported from places other than a
  module toplevel, e.g. inside a function or a class.

* Handle inference ambiguity for ``invalid-format-index``

  Close #2752

* Removed Python 2 specific checks such as ``relative-import``,
  ``invalid-encoded-data``, ``missing-super-argument``.

* Support forward references for ``function-redefined`` check.

  Close #2540

* Handle redefinitions in case of type checking imports.

  Close #2834

* Added a new check, ``consider-using-sys-exit``

  This check is emitted when we detect that a quit() or exit() is invoked
  instead of sys.exit(), which is the preferred way of exiting in program.

  Close #2925

* ``useless-suppression`` check now ignores ``cyclic-import`` suppressions,
  which could lead to false postiives due to incomplete context at the time
  of the check.

  Close #3064

* Added new checks, ``no-else-break`` and ``no-else-continue``

  These checks highlight unnecessary ``else`` and ``elif`` blocks after
  ``break`` and ``continue`` statements.

  Close #2327

* Don't emit ``protected-access`` when a single underscore prefixed attribute
  is used inside a special method

  Close #1802

* Fix the "statement" values in the PyLinter's stats reports by module.

* Added a new check, ``invalid-overridden-method``

  This check is emitted when we detect that a method is overridden
  as a property or a property is overridden as a method. This can indicate
  a bug in the application code that will trigger a runtime error.

  Close #2670

* Added a new check, ``arguments-out-of-order``

  This check warns if you have arguments with names that match those in
  a function's signature but you are passing them in to the function
  in a different order.

  Close #2975

* Added a new check, ``redeclared-assigned-name``

  This check is emitted when ``pylint`` detects that a name
  was assigned one or multiple times in the same assignment,
  which indicate a potential bug.
  Close #2898

* Ignore lambda calls with variadic arguments without a context.

  Inferring variadic positional arguments and keyword arguments
  will result into empty Tuples and Dicts, which can lead in
  some cases to false positives with regard to no-value-for-parameter.
  In order to avoid this, until we'll have support for call context
  propagation, we're ignoring such cases if detected.
  We already did that for function calls, but the previous fix
  was not taking in consideration ``lambdas``

  Close #2918

* Added a new check, ``self-assigning-variable``

  This check is emitted when we detect that a variable is assigned
  to itself, which might indicate a potential bug in the code application.
  Close #2930

* Added a new check, ``property-with-parameters``.

  This check is emitted when we detect that a defined property also
  has parameters, which are useless.
  Close #3006

* Excluded protocol classes from a couple of checks. Close #3002.

* Add a check `unnecessary-comprehension` that detects unnecessary comprehensions.

  This check is emitted when ``pylint`` finds list-, set- or dict-comprehensions,
  that are unnecessary and can be rewritten with the list-, set- or dict-constructors.

  Close #2905

* Excluded PEP 526 instance and class variables from ``no-member``. Close #2945

* Excluded `attrs` from `too-few-public-methods` check. Close #2988.

* ``unused-import`` emitted for the right import names in function scopes.

  Close #2928

* Dropped support for Python 3.4.

* ``assignment-from-no-return`` not triggered for async methods.

  Close #2902

* Don't emit ``attribute-defined-outside-init`` for variables defined in setters.

  Close #409

* Syntax errors report the column number.

  Close #2914

* Support fully qualified typing imports for type annotations.

  Close #2915

* Exclude ``__dict__`` from ``attribute-defined-outside-init``

* Fix pointer on spelling check when the error are more than one time in the same line.

  Close #2895

* Fix crash happening when parent of called object cannot be determined

* Allow of in `GoogleDocstring.re_multiple_type`

* Added `subprocess-run-check` to handle subrocess.run without explicitly set `check` keyword.

  Close #2848

* When we can't infer bare except handlers, skip ``try-except-raise``

  Close #2853

* Handle more `unnecessary-lambda` cases when dealing with additional kwargs in wrapped calls

  Close #2845

* Better postponed evaluation of annotations handling

  Close #2847

* Support postponed evaluation of annotations for variable annotations.

  Close #2838

* ``epylint.py_run`` defaults to ``python`` in case the current executable is not a Python one.

  Close #2837

* Ignore raw docstrings when running Similarities checker with `ignore-docstrings=yes` option

* Fix crash when calling ``inherit_from_std_ex`` on a class which is its own ancestor

  Close #2680

* Added a new check that warns the user if a function call is used inside a test but parentheses are missing.

  Close #2658

* ``len-as-condition`` now only fires when a ``len(x)`` call is made without an explicit comparison

  The message and description accompanying this checker has been changed
  reflect this new behavior, by explicitly asking to either rely on the
  fact that empty sequence are false or to compare the length with a scalar.

  Close #2684

* Add ``preferred-module`` checker that notify if an import has a replacement module that should be used.

  This check is emitted when ``pylint`` finds an imported module that has a
  preferred replacement listed in ``preferred-modules``.

* ``assigning-non-slot`` not emitted for classes with unknown base classes.

  Close #2807

* ``old-division`` is not emitted for non-Const nodes.

  Close #2808

* Added method arguments to the dot writer for pyreverse.

  Close #2139

* Support for linting file from stdin.

  IDEs may benefit from the support for linting from an in-memory file.

  Close #1187

* Added a new check `class-variable-slots-conflict`

  This check is emitted when ``pylint`` finds a class variable that conflicts with a slot
  name, which would raise a ``ValueError`` at runtime.

* Added new check: dict-iter-missing-items (E1141)

  Close #2761

* Fix issue with pylint name in output of python -m pylint --version

  Close #2764

* Relicense logo material under the CC BY-SA 4.0 license.

* Skip `if` expressions from f-strings for the `check_elif` checker

  Close #2816

* C0412 (ungrouped-import) is now compatible with isort.

  Close #2806

* Added new extension to detect too much code in a try clause

  Close #2877

* ``signature-mutators`` option was added

   With this option, users can choose to ignore `too-many-function-args`, `unexpected-keyword-arg`,
   and `no-value-for-parameter` for functions decorated with decorators that change
   the signature of a decorated function.

   Close #259

* Fixed a pragma comment on its own physical line being ignored when part
  of a logical line with the previous physical line.

  Close #199

* Fixed false `undefined-loop-variable` for a function defined in the loop,
  that uses the variable defined in that loop.

  Close #202

* Fixed `unused-argument` and `function-redefined` getting raised for
  functions decorated with `typing.overload`.

  Close #1581

* Fixed a false positive with ``consider-using-dict-comprehension`` for constructions that can't be converted to a comprehension

  Close #2963

* Added ``__post_init__`` to ``defining-attr-methods`` in order to avoid ``attribute-defined-outside-init`` in dataclasses.

  Close #2581

* Changed description of W0199 to use the term 2-item-tuple instead of 2-uple.

* Allow a `.` as a prefix for Sphinx name resolution.

* Checkers must now keep a 1 to 1 relationship between "msgid" (ie: C1234) and "symbol" (ie : human-readable-symbol)
* In checkers, an old_names can now be used for multiple new messages and pylint is now a little faster

Caused by #1164. It means if you do a partial old_names for a message definition an exception will tell you that you
must rename the associated identification.

* Allow the choice of f-strings as a valid way of formatting logging strings.

Closes #2395

* Added ``--list-msgs-enabled`` command to list all enabled and disabled messages given the current RC file and command line arguments.

What's New in Pylint 2.3.0?
===========================

Release date: 2019-02-27

* Protect against `NonDeducibleTypeHierarchy` when calling semi-private `is_subtype`

  `astroid.helpers.is_subtype` raises `NonDeducibleTypeHierarchy` when it cannot infer
  the base classes of the given types, but that makes sense in its context given that
  the method is mostly used to inform the inference process about the hierarchy of classes.
  Doesn't make that much sense for ``pylint`` itself, which is why we're handling the
  exception here, rather than in ``astroid``

  Close PyCQA/astroid#644

* Added a new command line option ``list-groups`` for listing all the check groups ``pylint`` knows about.

* Allow ``BaseException`` for emitting ``broad-except``, just like ``Exception``.

  Close #2741

* Fixed a crash that occurred for ``bad-str-strip-call`` when ``strip()`` received ``None``

  Close #2743

* Don't emit ``*-not-iterating`` checks for builtins consumed by ``itertools``

  Close #2731

* Fix a crash caused by iterating over ``Uninferable`` in a string formatting check.

  Close #2727

* Fixed false positives for ``no-self-argument`` and ``unsubscriptable-object`` when using ``__class_getitem__`` (new in Python 3.7)

  Close #2416

* Support ``Ellipsis`` as a synonym for ``pass`` statements.

  Close #2718

* ``fixme`` gets triggered only on comments.

  Close #2321

* Fixed a false positive for ``unused-variable`` and ``nonlocal`` assignments

  Close #2671

* Added ``load_configuration()`` hook for plugins

  New optional hook for plugins is added: ``load_configuration()``.
  This hook is executed after configuration is loaded to prevent
  overwriting plugin specific configuration via user-based
  configuration.

  Close #2635

* Fix missing-raises-doc false positive (W9006)

  Close #1502

* Exempt starred unpacking from ``*-not-iterating`` Python 3 checks

  Close #2651

* Make ``compare-to-zero`` less zealous by checking against equality and identity

  Close #2645

* Add ``no-else-raise`` warning (R1720)

  Close #2558

* Exempt ``yield from`` from ``*-not-iterating`` Python 3 checks.

  Close #2643

* Fix incorrect generation of ``no-else-return`` warnings (R1705)

  Fixed issue where ``if`` statements with nested ``if`` statements
  were incorrectly being flagged as ``no-else-return`` in some cases and
  not being flagged as ``no-else-return`` in other cases.  Added tests
  for verification and updated pylint source files to eliminate newly
  exposed warnings.

* Fix false positive with `not-async-context-manager` caused by not understanding `contextlib.asynccontextmanager`

  Close #2440

* Refactor ``bad-reversed-sequence`` to account for more objects that can define ``__reversed__``

  One such object would be an enum class, for which ``__reversed__`` yields each individual enum.
  As such, the check for ``bad-reversed-sequence`` needs to not differentiate between classes
  and instances when it comes for checking of ``__reversed__`` presence.

  Close #2598

* Added ``wrong-exception-operation``

  Used when an operation is done against an exception, but the operation
  is not valid for the exception in question. Usually emitted when having
  binary operations between exceptions in except handlers.

  Close #2494

* ``no-member`` is emitted for enums when they lack a member

  Previously we weren't doing this because we detected a
  ``__getattr__`` implementation on the ``Enum`` class
  (and this check is skipped for classes with ``__getattr__``),
  but that is fine for Enums, given that they are inferred in a customised
  way in astroid.

  Close #2565

* Generalize ``chained-comparison``

  Previous version incorrectly detects `a < b < c and b < d` and fails to
  detect `a < b < c and c < d`.

* Avoid popping __main__ when using multiple jobs

  Close #2689

* Add a new option 'check-str-concat-over-line-jumps' to check 'implicit-str-concat-in-sequence'

* Fixes for the new style logging format linter.

  The number of arguments was not handled properly, leading to an always
  successful check.

* Fix false positive ``not-callable`` for uninferable properties.

* Fix false positive ``useless-else-on-loop`` if the break is deep in the else
  of an inner loop.

* Minor improvements to the help text for a few options.


What's New in Pylint 2.2.2?
===========================

Release date: 2018-11-28

* Change the ``logging-format-style`` to use name identifier instead of their
  corresponding Python identifiers

  This is to prevent users having to think about escaping the default value for
  ``logging-format-style`` in the generated config file. Also our config parsing
  utilities don't quite support escaped values when it comes to ``choices`` detection,
  so this would have needed various hacks around that.

  Closes #2614


What's New in Pylint 2.2.1?
===========================

Release date: 2018-11-27

* Fix a crash caused by `implicit-str-concat-in-sequence` and multi-bytes characters.

  Closes #2610

What's New in Pylint 2.2?
=========================

Release date: 2018-11-25

   * Consider ``range()`` objects for ``undefined-loop-variable`` leaking from iteration.

     Close #2533

   * ``deprecated-method`` can use the attribute name for identifying a deprecated method

     Previously we were using the fully qualified name, which we still do, but the fully
     qualified name for some ``unittest`` deprecated aliases leads to a generic
     deprecation function. Instead on relying on that, we now also rely on the attribute
     name, which should solve some false positives.

     Close #1653
     Close #1946

   * Fix compatibility with changes to stdlib tokenizer.

   * ``pylint`` is less eager to consume the whole line for pragmas

     Close #2485

   * Obtain the correct number of CPUs for virtualized or containerized environments.

     Close #2519

   * Change ``unbalanced-tuple-unpacking`` back to a warning.

     It used to be a warning until a couple of years ago, after it was promoted to
     an error. But the check might be suggesting the wrong thing in some cases,
     for instance when checking against ``sys.argv`` which cannot be known at static
     analysis time. Given it might rely on potential unknown data, it's best to
     have it as a warning.

     Close #2522

   * Remove ``enumerate`` usage suggestion when defining ``__iter__`` (C0200)

     Close #2477

   * Emit ``too-many-starred-assignment`` only when the number of Starred nodes is per assignment elements

     Close #2513

   * `try-except-raise` checker now handles multilevel inheritance hirerachy for exceptions correctly.

     Close #2484

   * Add a new check, ``simplifiable-if-expression`` for expressions like ``True if cond else False``.

     Close #2487

   * ``too-few-public-methods`` is not reported for ``typing.NamedTuple``

     Close #2459

   * ```too-few-public-methods`` is not reported for dataclasses created with options.

     Close #2488

   * Remove wrong modules from 'bad-python3-import'.

     Close #2453

   * The ``json`` reporter prints an empty list when no messages are emitted

     Close #2446

   * Add a new check, ``duplicate-string-formatting-argument``

     This new check is emitted whenever a duplicate string formatting argument
     is found.

     Close #497

   * ``assignment-from-no-return`` is not emitted for coroutines.

     Close #1715

   * Report format string type mismatches.

   * ``consider-using-ternary`` and ``simplified-boolean-expression`` no longer emit for sequence based checks

     Close #2473

   * Handle ``AstroidSyntaxError`` when trying to import a module.

     Close #2313

   * Allow ``__module__`` to be redefined at a class level. Close #2451

   * ``pylint`` used to emit a ``unused-variable`` error if unused import was found in the function. Now instead of
     ``unused-variable``, ``unused-import`` is emitted.

     Close #2421

   * Handle asyncio.coroutine when looking for ``not-an-iterable`` check.

     Close #996

   * The ``locally-enabled`` check is gone.

     Close #2442

   * Infer decorated methods when looking for method-hidden

     Close #2369

   * Pick the latest value from the inferred values when looking for ``raising-non-exception``

     Close #2431

   * Extend the TYPE_CHECKING guard to TYPE_CHECKING name as well, not just the attribute

     Close #2411

   * Ignore import x.y.z as z cases for checker `useless-import-alias`.

     Close #2309

   * Fix false positive ``undefined-variable`` and ``used-before-assignment`` with nonlocal keyword usage.

     Close #2049

   * Stop ``protected-access`` exception for missing class attributes

   * Don't emit `assignment-from-no-return` for decorated function nodes

     Close #2385

   * `unnecessary-pass` is now also emitted when a function or class contains only docstring and pass statement.

      In Python, stubbed functions often have a body that contains just a single `pass` statement,
      indicating that the function doesn't do anything. However, a stubbed function can also have just a
      docstring, and function with a docstring and no body also does nothing.

      Close #2208

   * ``duplicate-argument-name`` is emitted for more than one duplicate argument per function

      Close #1712

   * Allow double indentation levels for more distinguishable indentations

     Close #741

   * Consider tuples in exception handler for ``try-except-raise``.
     Close #2389

   * Fix astroid.ClassDef check in checkers.utils.is_subclass_of

   * Fix wildcard imports being ignored by the import checker

   * Fix external/internal distinction being broken in the import graph

   * Fix wildcard import check not skipping `__init__.py`

     Close #2430

   * Add new option to logging checker, ``logging_format_style``

   * Fix --ignore-imports to understand multi-line imports

     Close #1422
     Close #2019

   * Add a new check 'implicit-str-concat-in-sequence' to spot string concatenation inside lists, sets & tuples.

   * ``literal-comparison`` is now emitted for 0 and 1 literals.

What's New in Pylint 2.1.1?
===========================

Release date: 2018-08-07

   * fix pylint crash due to ``misplaced-format-function`` not correctly handling class attribute.
     Close #2384

   * Do not emit \*-builtin for Python 3 builtin checks when the builtin is used inside a try-except

     Close PyCQA/pylint#2228

   * ``simplifiable-if-statement`` not emitted when dealing with subscripts

What's New in Pylint 2.1?
=========================

Release date: 2018-08-01
   * `trailing-comma-tuple` gets emitted for ``yield`` statements as well.

      Close #2363

   * Get only the arguments of the scope function for `redefined-argument-from-local`

     Close #2364

   * Add a check `misplaced-format-function` which is emitted if format function is used on
     non str object.

     Close #2200

   * `chain.from_iterable` no longer emits `dict-{}-not-iterating` when dealing with dict values and keys

   * Demote the `try-except-raise` message from an error to a warning (E0705 -> W0706)

      Close #2323

   * Correctly handle the new name of the Python implementation of the `abc` module.

     Close PyCQA/astroid#2288

    * Modules with `__getattr__` are exempted by default from `no-member`

      There's no easy way to figure out if a module has a particular member when
      the said module uses `__getattr__`, which is a new addition to Python 3.7.
      Instead we assume the safe thing to do, in the same way we do for classes,
      and skip those modules from checking.

      Close #2331

    * Fix a false positive `invalid name` message when method or attribute name is longer then 30 characters.

      Close #2047

    * Include the type of the next branch in `no-else-return`

      Close #2295

    * Fix inconsistent behaviour for bad-continuation on first line of file

      Close #2281

     * Fix not being able to disable certain messages on the last line through
       the global disable option

       Close #2278

    * Don't emit `useless-return` when we have a single statement that is the return itself

      We still want to be explicit when a function is supposed to return
      an optional value; even though `pass` could still work, it's not explicit
      enough and the function might look like it's missing an implementation.
      Close #2300

   * Fix false-positive undefined-variable for self referential class name in lamdbas

      Close #704

    * Don't crash when `pylint` is unable to infer the value of an argument to `next()`

      Close #2316

    * Don't emit `not-an-iterable` when dealing with async iterators.

      But do emit it when using the usual iteration protocol against
      async iterators.

      Close #2311

   * Can specify a default docstring type for when the check cannot guess the type

      Close #1169


What's New in Pylint 2.0?
=========================

Release date: 2018-07-15
    * `try-except-raise` should not be emitted if there are any parent exception class handlers.

       Close #2284

    * `trailing-comma-tuple` can be emitted for `return` statements as well.

       Close #2269

    * Fix a false positive ``inconsistent-return-statements`` message when exception is raised
      inside an else statement.

      Close #1782

    * `ImportFrom` nodes correctly use the full name for the import sorting checks.

      Close #2181

    * [].extend and similar builtin operations don't emit `dict-*-not-iterating` with the Python 3 porting checker

      Close #2187

    * Add a check `consider-using-dict-comprehension` which is emitted if for dict initialization
      the old style with list comprehensions is used.

    * Add a check `consider-using-set-comprehension` which is emitted if for set initialization
      the old style with list comprehensions is used.

    * `logging-not-lazy` is emitted whenever pylint infers that a string is built with addition

      Close #2193

    * Add a check `chained-comparison` which is emitted if a boolean operation can be simplified
      by chaining some of its operations.
      e.g "a < b and b < c", can be simplified as "a < b < c".

      Close #2032

    * Add a check `consider-using-in` for comparisons of a variable against
      multiple values with "==" and "or"s instead of checking if the variable
      is contained "in" a tuple of those values.

    * `in` is considered iterating context for some of the Python 3 porting checkers

      Close #2186

    * Add `--ignore-none` flag to control if pylint should warn about `no-member` where the owner is None

    * Fix a false positive related to `too-many-arguments` and bounded `__get__` methods

      Close #2172

    * `mcs` as the first parameter of metaclass's `__new__` method was replaced by `cls`

      Close #2028

    * `assignment-from-no-return` considers methods as well.

       Close #2081

    * Support typing.TYPE_CHECKING for *unused-import* errors

      Close #1948

    * Inferred classes at a function level no longer emit `invalid-name`
      when they don't respect the variable regular expression

      Close #1049

    * Added basic support for postponed evaluation of function annotations.

      Close #2069

    * Fix a bug with `missing-kwoa` and variadics parameters

      Close #1111

    * `simplifiable-if-statement` takes in account only when assigning to same targets

       Close #1984

    * Make ``len-as-condition`` test more cases, such as ``len() < 1`` or ``len <= 0``

    * Fix false-positive ``line-too-long`` message emission for
      commented line at the end of a module

      Close #1950

    * Fix false-positive ``bad-continuation`` for with statements

      Close #461

    * Don't warn about `stop-iteration-return` when using `next()` over `itertools.count`

      Close #2158

    * Add a check `consider-using-get` for unidiomatic usage of value/default-retrieval
      for a key from a dictionary

      Close #2076

    * invalid-slice-index is not emitted when the slice is used as index for a complex object.

      We only use a handful of known objects (list, set and friends) to figure out if
      we should emit invalid-slice-index when the slice is used to subscript an object.

    * Don't emit `unused-import` anymore for typing imports used in type comments.

    * Add a new check 'useless-import-alias'.

      Close #2052

    * Add `comparison-with-callable` to warn for comparison with bare callable, without calling it.

      Close #2082

    * Don't warn for ``missing-type-doc`` and/or ``missing-return-type-doc``, if type
      annotations exist on the function signature for a parameter and/or return type.
      Close #2083

    * Add `--exit-zero` option for continuous integration scripts to more
      easily call Pylint in environments that abort when a program returns a
      non-zero (error) status code.

      Close #2042

    * Warn if the first argument of an instance/ class method gets assigned

      Close #977

    * New check `comparison-with-itself` to check comparison between same value.

      Close #2051

    * Add a new warning, 'logging-fstring-interpolation', emitted when f-string
      is used within logging function calls.

      Close #1998

    * Don't show 'useless-super-delegation' if the subclass method has different type annotations.

      Close #1923

    * Add `unhashable-dict-key` check.

      Closes #586

    * Don't warn that a global variable is unused if it is defined by an import

      Close #1453

    * Skip wildcard import check for `__init__.py`.

      Close #2026

    * The Python 3 porting mode can now run with Python 3 as well.

    * `too-few-public-methods` is not emitted for dataclasses.

       Close #1793

    * New verbose mode option, enabled with `--verbose` command line flag, to
      display of extra non-checker-related output. It is disabled by default.

      Close #1863

    * `undefined-loop-variable` takes in consideration non-empty iterred objects before emitting

      Close #2039

    * Add support for numpydoc optional return value names.

      Close #2030

    * `singleton-comparison` accounts for negative checks

      Close #2037

    * Add a check `consider-using-in` for comparisons of a variable against
      multiple values with "==" and "or"s instead of checking if the variable
      is contained "in" a tuple of those values.

      Close #1977

    * defaultdict and subclasses of dict are now handled for dict-iter-* checks

      Close #2005

    * `logging-format-interpolation` also emits when f-strings are used instead of % syntax.

      Close #1788

    * Don't trigger misplaced-bare-raise when the raise is in a finally clause

      Close #1924

    * Add a new check, `possibly-unused-variable`.

      This is similar to `unused-variable`, the only difference is that it is
      emitted when we detect a locals() call in the scope of the unused variable.
      The `locals()` call could potentially use the said variable, by consuming
      all values that are present up to the point of the call. This new check
      allows to disable this error when the user intentionally uses `locals()`
      to consume everything.

      Close #1909.

    * `no-else-return` accounts for multiple cases

       The check was a bit overrestrictive because we were checking for
       return nodes in the .orelse node. At that point though the if statement
       can be refactored to not have the orelse. This improves the detection of
       other cases, for instance it now detects TryExcept nodes that are part of
       the .else branch.

       Close #1852

    * Added two new checks, `invalid-envvar-value` and `invalid-envvar-default`.

      The former is trigger whenever pylint detects that environment variable manipulation
      functions uses a different type than strings, while the latter is emitted whenever
      the said functions are using a default variable of different type than expected.

    * Add a check `consider-using-join` for concatenation of strings using str.join(sequence)

      Close #1952

    * Add a check `consider-swap-variables` for swapping variables with tuple unpacking

      Close #1922

    * Add new checker `try-except-raise` that warns the user if an except handler block
      has a ``raise`` statement as its first operator. The warning is shown when there is
      a bare raise statement, effectively re-raising the exception that was caught or the
      type of the exception being raised is the same as the one being handled.

    * Don't crash on invalid strings when checking for `logging-format-interpolation`

      Close #1944

    * Exempt `__doc__` from triggering a `redefined-builtin`

      `__doc__` can be used to specify a docstring for a module without
      passing it as a first-statement string.

    * Fix false positive bad-whitespace from function arguments with default
      values and annotations

      Close #1831

    * Fix stop-iteration-return false positive when next builtin has a
      default value in a generator

      Close #1830

    * Fix emission of false positive ``no-member`` message for class with  "private" attributes whose name is mangled.

      Close #1643

    * Fixed a crash which occurred when `Uninferable` wasn't properly handled in `stop-iteration-return`

      Close #1779

    * Use the proper node to get the name for redefined functions (#1792)

      Close #1774

    * Don't crash when encountering bare raises while checking inconsistent returns

      Close #1773

    * Fix a false positive ``inconsistent-return-statements`` message when if statement is inside try/except.

      Close #1770

    * Fix a false positive ``inconsistent-return-statements`` message when while loop are used.

      Close #1772

    * Correct column number for whitespace conventions.

      Previously the column was stuck at 0

      Close #1649

    * Fix ``unused-argument`` false positives with overshadowed variable in
      dictionary comprehension.

      Close #1731

    * Fix false positive ``inconsistent-return-statements`` message when never
      returning functions are used (i.e sys.exit for example).

      Close #1771

    * Fix error when checking if function is exception, as in ``bad-exception-context``.

    * Fix false positive ``inconsistent-return-statements`` message when a
      function is defined under an if statement.

      Close #1794

    * New ``useless-return`` message when function or method ends with a "return" or
      "return None" statement and this is the only return statement in the body.

    * Fix false positive ``inconsistent-return-statements`` message by
      avoiding useless exception inference if the exception is not handled.

      Close #1794 (second part)

    * Fix bad thread instantiation check when target function is provided in args.

      Close #1840

    * Fixed false positive when a numpy Attributes section follows a Parameters
      section

      Close #1867

    * Fix incorrect file path when file absolute path contains multiple ``path_strip_prefix`` strings.

      Close #1120

    * Fix false positive undefined-variable for lambda argument in class definitions

      Close #1824

    * Add of a new checker that warns the user if some messages are enabled or disabled
      by id instead of symbol.

      Close #1599

    * Suppress false-positive ``not-callable`` messages from certain
      staticmethod descriptors

      Close #1699

    * Fix indentation handling with tabs

      Close #1148

    * Fix false-positive ``bad-continuation`` error

      Close #638

    * Fix false positive unused-variable in lambda default arguments

      Close #1921
      Close #1552
      Close #1099
      Close #210

    * Updated the default report format to include paths that can be clicked on in some terminals (e.g. iTerm).

    * Fix inline def behavior with ``too-many-statements`` checker

      Close #1978

    * Fix `KeyError` raised when using docparams and NotImplementedError is documented.

      Close #2102

    * Fix 'method-hidden' raised when assigning to a property or data descriptor.

    * Fix emitting ``useless-super-delegation`` when changing the default value of keyword arguments.

      Close #2022

    * Expand ignored-argument-names include starred arguments and keyword arguments

      Close #2214

    * Fix false-positive undefined-variable in nested lambda

      Close #760

    * Fix false-positive ``bad-whitespace`` message for typing annoatations
      with ellipses in them

      Close 1992

    * Broke down "missing-docstrings" between "module", "class" and "function"

      For this to work we had to make multiple messages with the same old name
      possible.

      Closes #1164

What's New in Pylint 1.9?
=========================

Release date: 2018-05-15

    * Added two new Python 3 porting checks, `exception-escape` and `comprehension-escape`

      These two are emitted whenever pylint detects that a variable defined in the
      said blocks is used outside of the given block. On Python 3 these values are deleted.

    * Added a new `deprecated-sys-function`, emitted when accessing removed sys members.

    * Added `xreadlines-attribute`, emitted when the `xreadlines()` attribute is accessed.

    * The Python 3 porting mode can now run with Python 3 as well.

    * docparams extension allows abstract methods to document what overriding
      implementations should return, and to raise NotImplementedError without
      documenting it.

      Closes #2044

    * Special methods do not count towards `too-few-methods`,
      and are considered part of the public API.

    * Enum classes do not trigger `too-few-methods`

      Close #605

    * Added a new Python 2/3 check for accessing `operator.div`, which is removed in Python 3

      Close #1936

    * Added a new Python 2/3 check for accessing removed urllib functions

      Close #1997


What's New in Pylint 1.8.1?
===========================

Release date: 2017-12-15

    * Wrong version number in __pkginfo__.


What's New in Pylint 1.8?
=========================

Release date: 2017-12-15

    * Respect disable=... in config file when running with --py3k.

    * New warning `shallow-copy-environ` added

      Shallow copy of os.environ doesn't work as people may expect. os.environ
      is not a dict object but rather a proxy object, so any changes made
      on copy may have unexpected effects on os.environ

      Instead of copy.copy(os.environ) method os.environ.copy() should be
      used.

      See https://bugs.python.org/issue15373 for details.

      Close #1301

    * Do not display no-absolute-import warning multiple times per file.

    * `trailing-comma-tuple` refactor check now extends to assignment with
       more than one element (such as lists)

      Close #1713

    * Fixing u'' string in superfluous-parens message

      Close #1420

    * `abstract-class-instantiated` is now emitted for all inference paths.

       Close #1673

    * Add set of predefined naming style to ease configuration of checking
      naming conventions.

      Closes #1013

    * Added a new check, ``keyword-arg-before-vararg``

      This is emitted for function definitions
      in which keyword arguments are placed before variable
      positional arguments (\*args).

      This may lead to args list getting modified if keyword argument's value
      is not provided in the function call assuming it will take default value
      provided in the definition.

    * The `invalid-name` check contains the name of the template that caused the failure

      Close #1176

    * Using the -j flag won't start more child linters than needed.

      Contributed by Roman Ivanov in #1614

    * Fix a false positive with bad-python3-import on relative imports

      Close #1608

    * Added a new Python 3 check, ``non-ascii-bytes-literals``

      Close #1545

    * Added a couple of new Python 3 checks for accessing dict methods in non-iterable context

    * Protocol checks (not-a-mapping, not-an-iterable and co.) aren't emitted on classes with dynamic getattr

    * Added a new warning, 'bad-thread-instantiation'

      This message is emitted when the threading.Thread class does not
      receive the target argument, but receives just one argument, which
      is by default the group parameter.

      Close #1327

    * In non-quiet mode, absolute path of used config file is logged to
      standard error.
      Close #1519

    * Raise meaningful exception for invalid reporter class being selected

      When unknown reporter class will be selected as Pylint reporter,
      meaningful error message would be raised instead of bare ``ImportError``
      or ``AttribueError`` related to module or reporter class being not found.
      Close #1388

    * Added a new Python 3 check for accessing removed functions from itertools
      like ``izip`` or ``ifilterfalse``

    * Added a new Python 3 check for accessing removed fields from the types
      module like ``UnicodeType`` or ``XRangeType``

    * Added a new Python 3 check for declaring a method ``next`` that would have
      been treated as an iterator in Python 2 but a normal function in Python 3.

    * Added a new key-value pair in json output. The key is ``message-id``
      and the value is the message id.
      Close #1512

    * Added a new Python 3.0 check for raising a StopIteration inside a generator.
      The check about raising a StopIteration inside a generator is also valid if the exception
      raised inherit from StopIteration.
      Close #1385

    * Added a new warning, ``raising-format-tuple``, to detect multi-argument
      exception construction instead of message string formatting.

    * Added a new check for method of logging module that concatenate string via + operator
      Close #1479

    * Added parameter for limiting number of suggestions in spellchecking checkers

    * Fix a corner-case in ``consider-using-ternary`` checker.

      When object ``A`` used in  ``X and A or B`` was falsy in boolean context,
      Pylint incorrectly emitted non-equivalent ternary-based suggestion.
      After a change message is correctly not emitted for this case.
      Close #1559

    * Added ``suggestion-mode`` configuration flag. When flag is enabled, informational
      message is emitted instead of cryptic error message for attributes accessed on
      c-extensions.
      Close #1466

    * Fix a false positive ``useless-super-delegation`` message when
      parameters default values are different from those used in the base class.
      Close #1085

    * Disabling 'wrong-import-order', 'wrong-import-position', or
      'ungrouped-imports' for a single line now prevents that line from
      triggering violations on subsequent lines.

      Close #1336

    * Added a new Python check for inconsistent return statements inside method or function.
      Close #1267

    * Fix ``superfluous-parens`` false positive related to handling logical statements
      involving ``in`` operator.

      Close #574

    * ``function-redefined`` message is no longer emitted for functions and
      methods which names matches dummy variable name regular expression.
      Close #1369

    * Fix ``missing-param-doc`` and ``missing-type-doc`` false positives when
      mixing ``Args`` and ``Keyword Args`` in Google docstring.
      Close #1409

     * Fix ``missing-docstring`` false negatives when modules, classes, or methods
       consist of compound statements that exceed the ``docstring-min-length``

    * Fix ``useless-else-on-loop`` false positives when break statements are
      deeply nested inside loop.
      Close #1661

    * Fix no ``wrong-import-order`` message emitted on ordering of first and third party
      libraries. With this fix, pylint distinguishes third and first party
      modules when checking import order.
      Close #1702

    * Fix ``pylint disable=fixme`` directives ignored for comments following the
      last statement in a file.
      Close #1681

    * Fix ``line-too-long`` message deactivated by wrong disable directive.
      The directive ``disable=fixme`` doesn't deactivate anymore the emission
      of ``line-too-long`` message for long commented lines.
      Close #1741

    * If the rcfile specified on the command line doesn't exist, then an
      IOError exception is raised.
      Close #1747

    * Fix the wrong scope of the ``disable=`` directive after a commented line.
      For example when a ``disable=line-too-long`` directive is at the end of
      a long commented line, it no longer disables the emission of ``line-too-long``
      message for lines that follow.
      Close #1742

What's New in Pylint 1.7.1?
===========================

Release date: 2017-04-17

    * Fix a false positive which occurred when an exception was reraised

      Close #1419

    * Fix a false positive of ``disallow-trailing-tuple``

      The check was improved by verifying for non-terminating newlines, which
      should exempt function calls and function definitions from the check
      Close #1424


What's New in Pylint 1.7?
=========================

Release date: 2017-04-13

    * Don't emit missing-final-newline or trailing-whitespace for formfeeds (page breaks).

      Close #1218 and #1219

    * Don't emit by default no-member if we have opaque inference objects in the inference results

      This is controlled through the new flag ignore-on-opaque-inference, which is by
      default True. The inference can return  multiple potential results while
      evaluating a Python object, but some branches might not be evaluated, which
      results in partial inference. In that case, it might be useful to still emit
      no-member and other checks for the rest of the inferred objects.

    * Added new message `assign-to-new-keyword` to warn about assigning to names which
      will become a keyword in future Python releases.

      Close #1351

    * Split the 'missing or differing' in parameter documentation in different error.
      'differing-param-doc' covers the differing part of the old 'missing-param-doc',
      and 'differing-type-doc' covers the differing part of the old 'missing-type-doc'

      Close #1342

    * Added a new error, 'used-prior-global-declaration', which is emitted when a name
      is used prior a global declaration in a function. This causes a SyntaxError in
      Python 3.6

      Close #1257

    * The protocol checks are emitting their messages when a special method is set to None.

      Close #1263

    * Properly detect if imported name is assigned to same name in different
      scope.

      Close #636, #848, #851, and #900

    * Require one space for annotations with type hints, as per PEP 8.

    * 'trailing-comma-tuple' check was added

      This message is emitted when pylint finds an one-element tuple,
      created by a stray comma. This can suggest a potential problem in the
      code and it is recommended to use parantheses in order to emphasise the
      creation of a tuple, rather than relying on the comma itself.

    * Don't emit not-callable for instances with unknown bases.

      Close #1213

    * Treat keyword only arguments the same as positional arguments with regard to unused-argument check

    * Don't try to access variables defined in a separate scope when checking for ``protected-access``

    * Added new check to detect incorrect usage of len(SEQUENCE) inside
      test conditions.

    * Added new extension to detect comparisons against empty string constants

    * Added new extension to detect comparisons of integers against zero

    * Added new error conditions for 'bad-super-call'

      Now detects ``super(type(self), self)`` and ``super(self.__class__, self)``
      which can lead to recursion loop in derived classes.

    * PyLinter.should_analyze_file has a new optional parameter, called `is_argument`

      Close #1079

    * Add attribute hints for missing members

      Closes #1035

    * Add a new warning, 'redefined-argument-from-local'

      Closes #649

    * Support inline comments for comma separated values in the config file

      Closes #1024

    * epylint.py_run's *script* parameter was removed.

    * epylint.py_run now uses ``shell=False`` for running the underlying process.

      Closes #441

    * Added a new warning, 'useless-super-delegation'

      Close 839.

    * Added a new error, 'invalid-metaclass', raised when
      we can detect that a class is using an improper metaclass.

      Close #579

    * Added a new refactoring message, 'literal-comparison'.

      Close #786

    * arguments-differ takes in consideration kwonlyargs and variadics

      Close #983

    * Removed --optimized-ast. Part of #975.

    * Removed --files-output option. Part of #975.

    * Removed pylint-gui from the package.

    * Removed the HTML reporter. Part of #975.

    * ignored-argument-names is now used for ignoring arguments for unused-variable check.

      This option was used for ignoring arguments when computing the correct number of arguments
      a function should have, but for handling the arguments with regard
      to unused-variable check, dummy-variables-rgx was used instead. Now, ignored-argument-names
      is used for its original purpose and also for ignoring the matched arguments for
      the unused-variable check. This offers a better control of what should be ignored
      and how.
      Also, the same option was moved from the design checker to the variables checker,
      which means that the option now appears under the ``[VARIABLES]`` section inside
      the configuration file.
      Close #862.

    * Fix a false positive for keyword variadics with regard to keyword only arguments.

      If a keyword only argument was necessary for a function, but that function was called
      with keyword variadics (\**kwargs), then we were emitting a missing-kwoa false positive,
      which is now fixed.

      Close #934.

    * Fix some false positives with unknown sized variadics.

      Close #878

    * Added a new extension, check_docstring, for checking PEP 257 conventions.

      Closes #868.

    * config files with BOM markers can now be read.

      Close #864.

    * epylint.py_run does not crash on big files, using .communicate() instead of .wait()

      Close #599

    * Disable reports by default and show the evaluation score by default

      As per discussion from issue #746, the reports were disabled by
      default in order to simplify the interaction between the tool
      and the users. The score is still shown by default, as a way of
      closely measuring when it increases or decreases due to changes
      brought to the code.

    * Disable the information category messages by default.

      This is a step towards making pylint more sane, as
      per the discussion from issue #746.

    * Catch more cases as not proper iterables for __slots__ with
      regard to invalid-slots pattern. Closes issue #775.

    * empty indent strings are rejected.

    * Added a new error, 'relative-beyond-top-level', which is emitted
      when a relative import was attempted beyond the top level package.

      Closes issue #588.

    * Added a new warning, 'unsupported-assignment-operation', which is
      emitted when item assignment is tried on an object which doesn't
      have this ability. Closes issue #591.

    * Added a new warning, 'unsupported-delete-operation', which is
      emitted when item deletion is tried on an object which doesn't
      have this ability. Closes issue #592.

    * Fix a false positive of 'redundant-returns-doc', occurred when the documented
      function was using *yield* instead of *return*.

      Closes issue #984.

    * Fix false positives of 'missing-[raises|params|type]-doc' due to not
      recognizing keyword synonyms supported by Sphinx.

    * Added a new refactoring message, 'consider-merging-isinstance', which is
      emitted whenever we can detect that consecutive isinstance calls can be
      merged together.

      Closes issue #968

    * Fix a false positive of 'missing-param-doc' and 'missing-type-doc',
      occurred when a class docstring uses the 'For the parameters, see'
      magic string but the class __init__ docstring does not, or vice versa.

    * `redefined-outer-name` is now also emitted when a nested loop's target
      variable is the same as a target variable in an outer loop.

      Closes issue #911.

    * Added proper exception type inference for 'missing-raises-doc'.

    * Added InvalidMessageError exception class to replace asserts in
      pylint.utils.

    * More thorough validation in MessagesStore.register_messages() to avoid
      one message accidentally overwriting another.

    * InvalidMessageError, UnknownMessage, and EmptyReport exceptions are
      moved to the new pylint.exceptions submodule.

    * UnknownMessage and EmptyReport are renamed to UnknownMessageError and
      EmptyReportError.

    * Warnings 'missing-returns-type-doc' and 'missing-yields-type-doc'
      have each been split into two warnings - 'missing-[return|yield]-doc'
      and 'missing-[return|yield]-type-doc'.

    * Added epytext support to docparams extension.

      Closes #1029.

    * Support having plugins with the same name and with options defined

      Closes #1018

    * Sort configuration options in a section

      Closes #1087

    * Added a new Python 3 warning around implementing '__div__', '__idiv__', or
      '__rdiv__' as those methods are phased out in Python 3.

    * Added a new warning, 'overlapping-except', which is
      emitted when two exceptions in the same except-clause are aliases
      for each other or one exceptions is an ancestor of another.

    * Avoid crashing on ill-formatted strings when checking for string formatting errors.

    * Added a new Python 3 warning for calling 'str.encode' or 'str.decode' with a non-text
      encoding.

    * Added new coding convention message, 'single-string-used-for-slots'.

      Closes #1166

    * Added a new Python 3 check for accessing 'sys.maxint' which was removed in Python 3 in favor
      of 'sys.maxsize'

    * Added a new Python 3 check for bad imports.

    * Added a new Python 3 check for accessing deprecated string functions.

    * Do not warn about unused arguments or function being redefined in singledispatch
      registered implementations.

      Closes #1032 and #1034

    * Added refactoring message 'no-else-return'.

    * Improve unused-variable checker to warn about unused variables in module scope.

      Closes #919

    * Ignore modules import as _ when checking for unused imports.

      Closes #1190

    * Improve handing of Python 3 classes with metaclasses declared in nested scopes.

      Closes #1177

    * Added refactoring message 'consider-using-ternary'.

      Closes #1204

    * Bug-fix for false-positive logging-format-interpolation` when format specifications
      are used in formatted string.

      Fixes #572

    * Added a new switch ``single-line-class-stmt`` to allow single-line declaration
      of empty class bodies.

      Closes #738

    * Protected access in form `type(self)._attribute` are now allowed.

      Fixes #1031

    * Let the user modify msg-template when Pylint is called from a Python script

      Fixes #1269

    * Imports checker supports new switch ``allow-wildcard-with-all`` which disables
      warning on wildcard import when imported module defines `__all__` variable.

      Fixes #831

    * `too-many-format-args` and `too-few-format-args` are emitted correctly when
      starred expression are used in RHS tuple.

      Fixes #957

    * `cyclic-import` checker supports local disable clauses. When one
      of cycle imports was done in scope where disable clause was active,
      cycle is not reported as violation.

      Fixes #59


What's new in Pylint 1.6.3?
===========================

Release date: 2016-07-18

    * Do not crash when inferring uninferable exception types for docparams extension

      Close #998


What's new in Pylint 1.6.2?
===========================

Release date: TBA

    * Do not crash when printing the help of options with default regular expressions

      Close #990

    * More granular versions for deprecated modules.

      Close #991


What's new in Pylint 1.6.1?
===========================

Release date: 2016-07-07

    * Use environment markers for supporting conditional dependencies.


What's New in Pylint 1.6.0?
===========================

Release date: 2016-07-03

    * Added a new extension, `pylint.extensions.mccabe`, for warning
      about complexity in code.

    * Deprecate support for --optimize-ast. Part of #975.

    * Deprecate support for the HTML output. Part of #975.

    * Deprecate support for --output-files. Part of #975.

    * Fixed a documentation error for the check_docs extension. Fixes #735.

    * Made the list of property-defining decorators configurable.

    * Fix a bug where the top name of a qualified import was detected as unused variable.

      Close #923.

    * bad-builtin is now an extension check.

    * generated-members support qualified name through regular expressions.

      For instance, one can specify a regular expression as --generated-members=astroid.node_classes.*
      for ignoring every no-member error that is accessed as in `astroid.node_classes.missing.object`.

    * Add the ability to ignore files based on regex matching, with the new ``--ignore-patterns``
      option.

      This addresses issue #156 by allowing for multiple ignore patterns
      to be specified. Rather than clobber the existing ignore option, we
      introduced a new one called ignore-patterns.

    * Added a new error, 'trailing-newlines', which is emitted when a file
      has trailing new lines.

      Closes issue #682.

    * Add a new option, 'redefining-builtins-modules', for controlling the modules
      which can redefine builtins, such as six.moves and future.builtins.

      Close #464.

    * 'reimported' is emitted when the same name is imported from different module.

      Close #162.

    * Add a new recommendation checker, 'consider-iterating-dictionary', which is emitted
      which is emitted when a dictionary is iterated through .keys().

      Close #699

    * Use the configparser backport for Python 2

      This fixes a problem we were having with comments inside values, which is fixed
      in Python 3's configparser.
      Close #828

    * A new error was added, 'invalid-length-returned', when the `__len__`
      special method returned something else than a non-negative number.

      Close issue #557

    * Switch to using isort internally for wrong-import-order.

      Closes #879.

    * check_docs extension can find constructor parameters in __init__.

      Closes #887.

    * Don't warn about invalid-sequence-index if the indexed object has unknown base
      classes.

      Closes #867

    * Don't crash when checking, for super-init-not-called, a method defined in an if block.

    * Do not emit import-error or no-name-in-module for fallback import blocks by default.

      Until now, we warned with these errors when a fallback import block (a TryExcept block
      that contained imports for Python 2 and 3) was found, but this gets cumbersome when
      trying to write compatible code. As such, we don't check these blocks by default,
      but the analysis can be enforced by using the new ``--analyse-fallback-block`` flag.

      Close #769.


What's New in Pylint 1.5.5?
===========================

Release date: 2016-03-21


    * Let visit_importfrom from Python 3 porting checker be called when everything is disabled

      Because the visit method was filtering the patterns it was expecting to be activated,
      it didn't run when everything but one pattern was disabled, leading to spurious false
      positives

      Close #852

    * Don't emit unsubscriptable-value for classes with unknown
      base classes.

      Close #776.

    * Use an OrderedDict for storing the configuration elements

      This fixes an issue related to impredictible order of the disable / enable
      elements from a config file. In certain cases, the disable was coming before
      the enable which resulted in classes of errors to be enabled, even though the intention
      was to disable them. The best example for this was in the context of running multiple
      processes, each one of it having different enables / disables that affected the output.

      Close #815

    * Don't consider bare and broad except handlers as ignoring NameError,
      AttributeError and similar exceptions, in the context of checkers for
      these issues.

      Closes issue #826


What's New in Pylint 1.5.4?
===========================

Release date: 2016-01-15


    * Merge StringMethodChecker with StringFormatChecker. This fixes a
      bug where disabling all the messages and enabling only a handful of
      messages from the StringFormatChecker would have resulted in no
      messages at all.

    * Don't apply unneeded-not over sets.


What's New in Pylint 1.5.3?
===========================

Release date: 2016-01-11

    * Handle the import fallback idiom with regard to wrong-import-order.

      Closes issue #750.

    * Decouple the displaying of reports from the displaying of messages

      Some reporters are aggregating the messages instead of displaying
      them when they are available. The actual displaying was conflatted
      in the generate_reports. Unfortunately this behaviour was flaky
      and in the case of the JSON reporter, the messages weren't shown
      at all if a file had syntax errors or if it was missing.
      In order to fix this, the aggregated messages can now be
      displayed with Reporter.display_message, while the reports are
      displayed with display_reports.

      Closes issues #766 and #765.

    * Ignore function calls with variadic arguments without a context.

      Inferring variadic positional arguments and keyword arguments
      will result into empty Tuples and Dicts, which can lead in
      some cases to false positives with regard to no-value-for-parameter.
      In order to avoid this, until we'll have support for call context
      propagation, we're ignoring such cases if detected.
      Closes issue #722.

    * Treat AsyncFunctionDef just like FunctionDef nodes,
      by implementing visit_asyncfunctiondef in terms of
      visit_functiondef.

      Closes issue #767.

    * Take in account kwonlyargs when verifying that arguments
      are defined with the check_docs extension.

      Closes issue #745.

    * Suppress reporting 'unneeded-not' inside `__ne__` methods

      Closes issue #749.


What's New in Pylint 1.5.2?
===========================

Release date: 2015-12-21

    * Don't crash if graphviz is not installed, instead emit a
      warning letting the user to know.

      Closes issue #168.

    * Accept only functions and methods for the deprecated-method checker.

      This prevents a crash which can occur when an object doesn't have
      .qname() method after the inference.

    * Don't emit super-on-old-class on classes with unknown bases.
      Closes issue #721.

    * Allow statements in `if` or `try` blocks containing imports.

      Closes issue #714.


What's New in Pylint 1.5.1?
===========================

Release date: 2015-12-02


    * Fix a crash which occurred when old visit methods are encountered
      in plugin modules. Closes issue #711.

    * Add wrong-import-position to check_messages's decorator arguments
      for ImportChecker.leave_module
      This fixes an esoteric bug which occurs when ungrouped-imports and
      wrong-import-order are disabled and pylint is executed on multiple files.
      What happens is that without wrong-import-position in check_messages,
      leave_module will never be called, which means that the first non-import node
      from other files might leak into the current file,
      leading to wrong-import-position being emitted by pylint.

    * Fix a crash which occurred when old visit methods are encountered
      in plugin modules. Closes issue #711.

    * Don't emit import-self and cyclic-import for relative imports
      of modules with the same name as the package itself.
      Closes issues #708 and #706.


What's New in Pylint 1.5.0?
===========================

Release date: 2015-11-29


    * Added multiple warnings related to imports. 'wrong-import-order'
      is emitted when PEP 8 recommendations regarding imports are not
      respected (that is, standard imports should be followed by third-party
      imports and then by local imports). 'ungrouped-imports' is emitted
      when imports from the same package or module are not placed
      together, but scattered around in the code. 'wrong-import-position'
      is emitted when code is mixed with imports, being recommended for the
      latter to be at the top of the file, in order to figure out easier by
      a human reader what dependencies a module has.
      Closes issue #692.

    * Added a new refactoring warning, 'unneeded-not', emitted
      when an expression with the not operator could be simplified.
      Closes issue #670.

    * Added a new refactoring warning, 'simplifiable-if-statement',
      used when an if statement could be reduced to a boolean evaluation
      of its test. Closes issue #698.

    * Added a new refactoring warning, 'too-many-boolean-expressions',
      used when an if statement contains too many boolean expressions,
      which makes the code less maintainable and harder to understand.
      Closes issue #677.

    * Property methods are shown as attributes instead of functions in
      pyreverse class diagrams. Closes Issue #284

    * Add a new refactoring error, 'too-many-nested-blocks', which is emitted
      when a function or a method has too many nested blocks, which makes the
      code less readable and harder to understand. Closes issue #668.

    * Add a new error, 'unsubscriptable-object', that is emitted when
      value used in subscription expression doesn't support subscription
      (i.e. doesn't define __getitem__ method).

    * Don't warn about abstract classes instantiated in their own
      body. Closes issue #627.

    * Obsolete options are not present by default in the generated
      configuration file. Closes issue #632.

    * non-iterator-returned can detect classes with iterator-metaclasses.
      Closes issue #679.

    * Add a new error, 'unsupported-membership-test', emitted when value
      to the right of the 'in' operator doesn't support membership test
      protocol (i.e. doesn't define __contains__/__iter__/__getitem__)

    * Add new errors, 'not-an-iterable', emitted when non-iterable value
      is used in an iterating context (starargs, for-statement,
      comprehensions, etc), and 'not-a-mapping', emitted when non-mapping
      value is used in a mapping context. Closes issue #563.

    * Make 'no-self-use' checker not emit a warning if there is a 'super()'
      call inside the method.
      Closes issue #667.

    * Add checker to identify multiple imports on one line.
      Closes issue #598.

    * Fix unused-argument false positive when the "+=" operator is used.
      Closes issue #518.

    * Don't emit import-error for ignored modules. PyLint will not emit import
      errors for any import which is, or is a subpackage of, a module in
      the ignored-modules list. Closes issue #223.

    * Fix unused-import false positive when the import is used in a
      class assignment. Closes issue #475

    * Add a new error, 'not-context-manager', emitted when something
      that doesn't implement __enter__ and __exit__ is used in a with
      statement.

    * Add a new warning, 'confusing-with-statement', emitted by the
      base checker, when an ambiguous looking with statement is used.
      For example `with open() as first, second` which looks like a
      tuple assignment but is actually 2 context managers.

    * Add a new warning, 'duplicate-except', emitted when there is an
      exception handler which handles an exception type that was handled
      before. Closes issue #485.

    * A couple of warnings got promoted to errors, since they could uncover
      potential bugs in the code. These warnings are: assignment-from-none,
      unbalanced-tuple-unpacking, unpacking-non-sequence, non-iterator-returned.
      Closes issue #388.

    * Allow ending a pragma control with a semicolon. In this way, users
      can continue a pragma control with a reason for why it is used,
      as in `# pylint: disable=old-style-class;reason=...`.
      Closes issue #449.

    * --jobs can be used with --load-plugins now. Closes issue #456.

    * Improve the performance of --jobs when dealing only with a package
      name. Closes issue #479.

    * Don't emit an unused-wildcard-import when the imported name comes
      from another module and it is in fact a __future__ name.

    * The colorized reporter now works on Windows. Closes issue #96.

    * Remove pointless-except warning. It was previously disabled by
      default and it wasn't very useful. Closes issue #506.

    * Fix a crash on Python 3 related to the string checker, which
      crashed when it encountered a bytes string with a .format
      method called.

    * Don't warn about no-self-use for builtin properties.

    * Fix a false positive for bad-reversed-sequence, when a subclass
      of a `dict` provides a __reversed__ method.

    * Change the default no-docstring-rgx so missing-docstring isn't
      emitted for private functions.

    * Don't emit redefined-outer-name for __future__ directives.
      Closes issue #520.

    * Provide some hints for the bad-builtin message. Closes issue #522.

    * When checking for invalid arguments to a callable, in typecheck.py,
      look up for the __init__ in case the found __new__ comes from builtins.

      Since the __new__ comes from builtins, it will not have attached any
      information regarding what parameters it expects, so the check
      will be useless. Retrieving __init__ in that case will at least
      detect a couple of false negatives. Closes issue #429.

    * Don't emit no-member for classes with unknown bases.

      Since we don't know what those bases might add, we simply ignore
      the error in this case.

    * Lookup in the implicit metaclass when checking for no-member,
      if the class in question has an implicit metaclass, which is
      True for new style classes. Closes issue #438.

    * Add two new warnings, duplicate-bases and inconsistent-mro.

      duplicate-bases is emitted when a class has the same bases
      listed more than once in its bases definition, while inconsistent-mro
      is emitted when no sane mro hierarchy can be determined. Closes issue #526.

    * Remove interface-not-implemented warning. Closes issue #532.

    * Remove the rest of interface checks: interface-is-not-class,
      missing-interface-method, unresolved-interface. The reason is that
      its better to start recommending ABCs instead of the old Zope era
      of interfaces. One side effect of this change is that ignore-iface-methods
      becomes a noop, it's deprecated and it will be removed at some time.

    * Emit a proper deprecation warning for reporters.BaseReporter.add_message.

      The alternative way is to use handle_message. add_message will be removed in
      Pylint 1.6.

    * Added new module 'extensions' for optional checkers with the test
      directory 'test/extensions' and documentation file 'doc/extensions.rst'.

    * Added new checker 'extensions.check_docs' that verifies parameter
      documention in Sphinx, Google, and Numpy style.

    * Detect undefined variable cases, where the "definition" of an undefined
      variable was in del statement. Instead of emitting used-before-assignment,
      which is totally misleading, it now emits undefined-variable.
      Closes issue #528.

    * Don't emit attribute-defined-outside-init and access-member-before-definition
      for mixin classes. Actual errors can occur in mixin classes, but this is
      controlled by the ignore-mixin-members option. Closes issue #412.

    * Improve the detection of undefined variables and variables used before
      assignment for variables used as default arguments to function,
      where the variable was first defined in the class scope.
      Closes issue #342 and issue #404.

    * Add a new warning, 'unexpected-special-method-signature', which is emitted
      when a special method (dunder method) doesn't have the expected signature,
      which can lead to actual errors in the application code.
      Closes issue #253.

    * Remove 'bad-context-manager' due to the inclusion of 'unexpected-special-method-signature'.

    * Don't emit no-name-in-module if the import is guarded by an ImportError, Exception or
      a bare except clause.

    * Don't emit no-member if the attribute access node is protected by an
      except handler, which handles AttributeError, Exception or it is a
      bare except.

    * Don't emit import-error if the import is guarded by an ImportError, Exception or a
      bare except clause.

    * Don't emit undefined-variable if the node is guarded by a NameError, Exception
      or bare except clause.

    * Add a new warning, 'using-constant-test', which is emitted when a conditional
      statement (If, IfExp) uses a test which is always constant, such as numbers,
      classes, functions etc. This is most likely an error from the user's part.
      Closes issue #524.

    * Don't emit 'raising-non-exception' when the exception has unknown
      bases. We don't know what those bases actually are and it's better
      to assume that the user knows what he is doing rather than emitting
      a message which can be considered a false positive.

    * Look for a .pylintrc configuration file in the current folder,
      if pylintrc is not found. Dotted pylintrc files will not be searched
      in the parents of the current folder, as it is done for pylintrc.

    * Add a new error, 'invalid-unary-type-operand', emitted when
      an unary operand is used on something which doesn't support that
      operation (for instance, using the unary bitwise inversion operator
      on an instance which doesn't implement __invert__).

    * Take in consideration differences between arguments of various
      type of functions (classmethods, staticmethods, properties)
      when checking for `arguments-differ`. Closes issue #548.

    * astroid.inspector was moved to pylint.pyreverse, since it belongs
      there and it doesn't need to be in astroid.

    * astroid.utils.LocalsVisitor was moved to pylint.pyreverse.LocalsVisitor.

    * pylint.checkers.utils.excepts_import_error was removed.
      Use pylint.chekcers.utils.error_of_type instead.

    * Don't emit undefined-all-variables for nodes which can't be
      inferred (YES nodes).

    * yield-outside-func is also emitted for `yield from`.

    * Add a new error, 'too-many-star-expressions', emitted when
      there are more than one starred expression (`*x`) in an assignment.
      The warning is emitted only on Python 3.

    * Add a new error, 'invalid-star-assignment-target', emitted when
      a starred expression (`*x`) is used as the lhs side of an assignment,
      as in `*x = [1, 2]`. This is not a SyntaxError on Python 3 though.

    * Detect a couple of objects which can't be base classes (bool,
      slice, range and memoryview, which weren't detected until now).

    * Add a new error for the Python 3 porting checker, `import-star-module-level`,
      which is used when a star import is detected in another scope than the
      module level, which is an error on Python 3. Using this will emit a
      SyntaxWarning on Python 2.

    * Add a new error, 'star-needs-assignment-target', emitted on Python 3 when
      a Starred expression (`*x`) is not used in an assignment target. This is not
      caught when parsing the AST on Python 3, so it needs to be a separate check.

    * Add a new error, 'unsupported-binary-operation', emitted when
      two a binary arithmetic operation is executed between two objects
      which don't support it (a number plus a string for instance).
      This is currently disabled, since the it exhibits way too many false
      positives, but it will be reenabled as soon as possible.

    * New imported features from astroid into pyreverse: pyreverse.inspector.Project,
      pyreverse.inspector.project_from_files and pyreverse.inspector.interfaces.

      These were moved since they didn't belong in astroid.

    * Enable misplaced-future for Python 3. Closes issue #580.

    * Add a new error, 'nonlocal-and-global', which is emitted when a
      name is found to be both nonlocal and global in the same scope.
      Closes issue #581.

    * ignored-classes option can work with qualified names (ignored-classes=optparse.Values)
      Closes issue #297.

    * ignored-modules can work with qualified names as well as with Unix pattern
      matching for recursive ignoring. Closes issues #244.

    * Improve detection of relative imports in non-packages, as well as importing
      missing modules with a relative import from a package.

    * Don't emit no-init if not all the bases from a class are known.
      Closes issue #604.

    * --no-space-check option accepts `empty-line` as a possible option.
      Closes issue #541.

    * --generate-rcfile generates by default human readable symbols
      for the --disable option. Closes issue #608.

    * Improved the not-in-loop checker to properly detect more cases.

    * Add a new error, 'continue-in-finally', which is emitted when
      the `continue` keyword is found inside a `finally` clause, which
      is a SyntaxError.

    * The --zope flag is deprecated and it is slated for removal
      in Pylint 1.6.

      The reason behind this removal is the fact that it's a specialized
      flag and there are solutions for the original problem:
      use --generated-members with the members that causes problems
      when using Zope or add AST transforms tailored to the zope
      project.

      At the same time, --include-ids and --symbols will also be removed
      in Pylint 1.6. Closes issue #570.

    * missing-module-attribute was removed and the corresponding
      CLI option, required-attributes, which is slated for removal
      in Pylint 1.6.

    * missing-reversed-argument was removed.

      The reason behind this is that this kind of errors should be
      detected by the type checker for *all* the builtins and not
      as a special case for the reversed builtin. This will happen
      shortly in the future.

    * --comment flag is obsolete and it will be removed in Pylint 1.6.

    * --profile flag is obsolete and it will be removed in Pylint 1.6.

    * Add a new error, 'misplaced-bare-raise'.

      The error is used when a bare raise is not used inside an except clause.
      This can generate a RuntimeError in Python, if there are no active exceptions
      to be reraised. While it works in Python 2 due to the fact that the exception
      leaks outside of the except block, it's nevertheless a behaviour that
      a user shouldn't depend upon, since it's not obvious to the reader of the code
      what exception will be raised and it will not be compatible with Python 3 anyhow.
      Closes issue #633.

    * Bring logilab-common's ureports into pylint.reporters.

      With this change, we moved away from depending on logilab-common,
      having in Pylint all the components that were used from logilab-common.
      The API should be considered an implementation detail and can change at
      some point in the future.
      Closes issue #621.

    * `reimported` is emitted for reimported objects on the same line.

      Closes issue #639.

    * Abbreviations of command line options are not supported anymore.

      Using abbreviations for CLI options was never considered to be
      a feature of pylint, this fact being only a side effect of using optparse.
      As this was the case, using --load-plugin or other abbreviation
      for --load-plugins never actually worked, while it also didn't raise
      an error. Closes issue #424.

    * Add a new error, 'nonlocal-without-binding'

      The error is emitted on Python 3 when a nonlocal name is not bound
      to any variable in the parents scopes. Closes issue #582.

    * 'deprecated-module' can be shown for modules which aren't
       available. Closes issue #362.

    * Don't consider a class abstract if its members can't
      be properly inferred.

      This fixes a false positive related to abstract-class-instantiated.
      Closes issue #648.

    * Add a new checker for the async features added by PEP 492.

    * Add a new error, 'yield-inside-async-function', emitted on
      Python 3.5 and upwards when the `yield` statement is found inside
      a new coroutine function (PEP 492).

    * Add a new error, 'not-async-context-manager', emitted when
      an async context manager block is used with an object which doesn't
      support this protocol (PEP 492).

    * Add a new convention warning, 'singleton-comparison', emitted when
      comparison to True, False or None is found.

    * Don't emit 'assigning-non-slot' for descriptors. Closes issue #652.

    * Add a new error, 'repeated-keyword', when a keyword argument is passed
      multiple times into a function call.

      This is similar with redundant-keyword-arg, but it's mildly different
      that it needs to be a separate error.

    * --enable=all can now be used. Closes issue #142.

    * Add a new convention message, 'misplaced-comparison-constant',
      emitted when a constant is placed in the left hand side of a comparison,
      as in '5 == func()'. This is also called Yoda condition, since the
      flow of code reminds of the Star Wars green character, conditions usually
      encountered in languages with variabile assignments in conditional
      statements.

    * Add a new convention message, 'consider-using-enumerate', which is
      emitted when code that uses `range` and `len` for iterating is encountered.
      Closes issue #684.

    * Added two new refactoring messages, 'no-classmethod-decorator' and
      'no-staticmethod-decorator', which are emitted when a static method or a class
      method is declared without using decorators syntax.

      Closes issue #675.



What's New in Pylint 1.4.3?
===========================

Release date: 2015-03-14


    * Remove three warnings: star-args, abstract-class-little-used,
      abstract-class-not-used. These warnings don't add any real value
      and they don't imply errors or problems in the code.

    * Added a new option for controlling the peephole optimizer in astroid.
      The option ``--optimize-ast`` will control the peephole optimizer,
      which is used to optimize a couple of AST subtrees. The current problem
      solved by the peephole optimizer is when multiple joined strings,
      with the addition operator, are encountered. If the numbers of such
      strings is high enough, Pylint will then fail with a maximum recursion
      depth exceeded error, due to its visitor architecture. The peephole
      just transforms such calls, if it can, into the final resulting string
      and this exhibit a problem, because the visit_binop method stops being
      called (in the optimized AST it will be a Const node).


What's New in Pylint 1.4.2?
===========================

Release date: 2015-03-11

    * Don't require a docstring for empty modules. Closes issue #261.

    * Fix a false positive with `too-few-format-args` string warning,
      emitted when the string format contained a normal positional
      argument ('{0}'), mixed with a positional argument which did
      an attribute access ('{0.__class__}').
      Closes issue #463.

    * Take in account all the methods from the ancestors
      when checking for too-few-public-methods. Closes issue #471.

    * Catch enchant errors and emit 'invalid-characters-in-docstring'
      when checking for spelling errors. Closes issue #469.

    * Use all the inferred statements for the super-init-not-called
      check. Closes issue #389.

    * Add a new warning, 'unichr-builtin', emitted by the Python 3
      porting checker, when the unichr builtin is found. Closes issue #472.

    * Add a new warning, 'intern-builtin', emitted by the Python 3
      porting checker, when the intern builtin is found. Closes issue #473.

    * Add support for editable installations.

    * The HTML output accepts the `--msg-template` option. Patch by
      Dan Goldsmith.

    * Add 'map-builtin-not-iterating' (replacing 'implicit-map-evaluation'),
      'zip-builtin-not-iterating', 'range-builtin-not-iterating', and
      'filter-builtin-not-iterating' which are emitted by `--py3k` when the
      appropriate built-in is not used in an iterating context (semantics
      taken from 2to3).

    * Add a new warning, 'unidiomatic-typecheck', emitted when an explicit
      typecheck uses type() instead of isinstance(). For example,
      `type(x) == Y` instead of `isinstance(x, Y)`. Patch by Chris Rebert.
      Closes issue #299.

    * Add support for combining the Python 3 checker mode with the --jobs
      flag (--py3k and --jobs). Closes issue #467.

    * Add a new warning for the Python 3 porting checker, 'using-cmp-argument',
      emitted when the `cmp` argument for the `list.sort` or `sorted builtin`
      is encountered.

    * Make the --py3k flag commutative with the -E flag. Also, this patch
      fixes the leaks of error messages from the Python 3 checker when
      the errors mode was activated. Closes issue #437.


What's New in Pylint 1.4.1?
===========================

Release date: 2015-01-16

    * Look only in the current function's scope for bad-super-call.
      Closes issue #403.

    * Check the return of properties when checking for not-callable.
      Closes issue #406.

    * Warn about using the input() or round() built-ins for Python 3.
      Closes issue #411.

    * Proper abstract method lookup while checking for
      abstract-class-instantiated. Closes issue #401.

    * Use a mro traversal for finding abstract methods. Closes issue #415.

    * Fix a false positive with catching-non-exception and tuples of
      exceptions.

    * Fix a false negative with raising-non-exception, when the raise used
      an uninferrable exception context.

    * Fix a false positive on Python 2 for raising-bad-type, when
      raising tuples in the form 'raise (ZeroDivisionError, None)'.

    * Fix a false positive with invalid-slots-objects, where the slot entry
      was a unicode string on Python 2. Closes issue #421.

    * Add a new warning, 'redundant-unittest-assert', emitted when using
      unittest's methods assertTrue and assertFalse with constant value
      as argument. Patch by Vlad Temian.

    * Add a new JSON reporter, usable through -f flag.

    * Add the method names for the 'signature-differs' and 'argument-differs'
      warnings. Closes issue #433.

    * Don't compile test files when installing.

    * Fix a crash which occurred when using multiple jobs and the files
      given as argument didn't exist at all.


What's New in Pylint 1.4.0?
============================

Release date: 2014-11-23


    * Added new options for controlling the loading of C extensions.
      By default, only C extensions from the stdlib will be loaded
      into the active Python interpreter for inspection, because they
      can run arbitrary code on import. The option
      `--extension-pkg-whitelist` can be used to specify modules
      or packages that are safe to load.

    * Change default max-line-length to 100 rather than 80

    * Drop BaseRawChecker class which were only there for backward
      compat for a while now

    * Don't try to analyze string formatting with objects coming from
      function arguments. Closes issue #373.

    * Port source code to be Python 2/3 compatible. This drops the
      need for 2to3, but does drop support for Python 2.5.

    * Each message now comes with a confidence level attached, and
      can be filtered base on this level. This allows to filter out
      all messages that were emitted even though an inference failure
      happened during checking.

    * Improved presenting unused-import message. Closes issue #293.

    * Add new checker for finding spelling errors. New messages:
      wrong-spelling-in-comment, wrong-spelling-in-docstring.
      New options: spelling-dict, spelling-ignore-words.

    * Add new '-j' option for running checks in sub-processes.

    * Added new checks for line endings if they are mixed (LF vs CRLF)
      or if they are not as expected. New messages: mixed-line-endings,
      unexpected-line-ending-format. New option: expected-line-ending-format.

    * 'dangerous-default-value' no longer evaluates the value of the arguments,
      which could result in long error messages or sensitive data being leaked.
      Closes issue #282

    * Fix a false positive with string formatting checker, when
      encountering a string which uses only position-based arguments.
      Closes issue #285.

    * Fix a false positive with string formatting checker, when using
      keyword argument packing. Closes issue #288.

    * Proper handle class level scope for lambdas.

    * Handle 'too-few-format-args' or 'too-many-format-args' for format
      strings with both named and positional fields. Closes issue #286.

    * Analyze only strings by the string format checker. Closes issue #287.

    * Properly handle nested format string fields. Closes issue #294.

    * Don't emit 'attribute-defined-outside-init' if the attribute
      was set by a function call in a defining method. Closes issue #192.

    * Properly handle unicode format strings for Python 2.
      Closes issue #296.

    * Don't emit 'import-error' if an import was protected by a try-except,
      which excepted ImportError.

    * Fix an 'unused-import' false positive, when the error was emitted
      for all the members imported with 'from import' form.
      Closes issue #304.

    * Don't emit 'invalid-name' when assigning a name in an
      ImportError handler. Closes issue #302.

    * Don't count branches from nested functions.

    * Fix a false positive with 'too-few-format-args', when the format
      strings contains duplicate manual position arguments.
      Closes issue #310.

    * fixme regex handles comments without spaces after the hash.
      Closes issue #311.

    * Don't emit 'unused-import' when a special object is imported
      (__all__, __doc__ etc.). Closes issue #309.

    * Look in the metaclass, if defined, for members not found in the current
      class. Closes issue #306.

    * Don't emit 'protected-access' if the attribute is accessed using
      a property defined at the class level.

    * Detect calls of the parent's __init__, through a binded super() call.

    * Check that a class has an explicitly defined metaclass before
      emitting 'old-style-class' for Python 2.

    * Emit 'catching-non-exception' for non-class nodes. Closes issue #303.

    * Order of reporting is consistent.

    * Add a new warning, 'boolean-datetime', emitted when an instance
      of 'datetime.time' is used in a boolean context. Closes issue #239.

    * Fix a crash which occurred while checking for 'method-hidden',
      when the parent frame was something different than a function.

    * Generate html output for missing files. Closes issue #320.

    * Fix a false positive with 'too-many-format-args', when the format
      string contains mixed attribute access arguments and manual
      fields. Closes issue #322.

    * Extend the cases where 'undefined-variable' and 'used-before-assignment'
      can be detected. Closes issue #291.

    * Add support for customising callback identifiers, by adding a new
      '--callbacks' command line option. Closes issue #326.

    * Add a new warning, 'logging-format-interpolation', emitted when .format()
      string interpolation is used within logging function calls.

    * Don't emit 'unbalanced-tuple-unpacking' when the rhs of the assignment
      is a variable length argument. Closes issue #329.

    * Add a new warning, 'inherit-non-class', emitted when a class inherits
      from something which is not a class. Closes issue #331.

    * Fix another false positives with 'undefined-variable', where the variable
      can be found as a class assignment and used in a function annotation.
      Closes issue #342.

    * Handle assignment of the string format method to a variable.
      Closes issue #351.

    * Support wheel packaging format for PyPi. Closes issue #334.

    * Check that various built-ins that do not exist in Python 3 are not
      used: apply, basestring, buffer, cmp, coerce, execfile, file, long
      raw_input, reduce, StandardError, unicode, reload and xrange.

    * Warn for magic methods which are not used in any way in Python 3:
      __coerce__, __delslice__, __getslice__, __setslice__, __cmp__,
      __oct__, __nonzero__ and __hex__.

    * Don't emit 'assigning-non-slot' when the assignment is for a property.
      Closes issue #359.

    * Fix for regression: '{path}' was no longer accepted in '--msg-template'.

    * Report the percentage of all messages, not just for errors and warnings.
      Closes issue #319.

    * 'too-many-public-methods' is reported only for methods defined in a class,
      not in its ancestors. Closes issue #248.

    * 'too-many-lines' disable pragma can be located on any line, not only the
      first. Closes issue #321.

    * Warn in Python 2 when an import statement is found without a
      corresponding `from __future__ import absolute_import`.

    * Warn in Python 2 when a non-floor division operation is found without
      a corresponding `from __future__ import division`.

    * Add a new option, 'exclude-protected', for excluding members
      from the protected-access warning. Closes issue #48.

    * Warn in Python 2 when using dict.iter*(), dict.view*(); none of these
      methods are available in Python 3.

    * Warn in Python 2 when calling an object's next() method; Python 3 uses
      __next__() instead.

    * Warn when assigning to __metaclass__ at a class scope; in Python 3 a
      metaclass is specified as an argument to the 'class' statement.

    * Warn when performing parameter tuple unpacking; it is not supported in
      Python 3.

    * 'abstract-class-instantiated' is also emitted for Python 2.
      It was previously disabled.

    * Add 'long-suffix' error, emitted when encountering the long suffix
      on numbers.

    * Add support for disabling a checker, by specifying an 'enabled'
      attribute on the checker class.

    * Add a new CLI option, --py3k, for enabling Python 3 porting mode. This
      mode will disable all other checkers and will emit warnings and
      errors for constructs which are invalid or removed in Python 3.

    * Add 'old-octal-literal' to Python 3 porting checker, emitted when
      encountering octals with the old syntax.

    * Add 'implicit-map-evaluation' to Python 3 porting checker, emitted
      when encountering the use of map builtin, without explicit evaluation.



What's New in Pylint 1.3.0?
===========================

Release date: 2014-07-26

    * Allow hanging continued indentation for implicitly concatenated
      strings. Closes issue #232.

    * Pylint works under Python 2.5 again, and its test suite passes.

    * Fix some false positives for the cellvar-from-loop warnings.
      Closes issue #233.

    * Return new astroid class nodes when the inferencer can detect that
      that result of a function invocation on a type (like `type` or
      `abc.ABCMeta`) is requested. Closes #205.

    * Emit 'undefined-variable' for undefined names when using the
      Python 3 `metaclass=` argument.

    * Checkers respect priority now. Close issue #229.

    * Fix a false positive regarding W0511. Closes issue #149.

    * Fix unused-import false positive with Python 3 metaclasses (#143).

    * Don't warn with 'bad-format-character' when encountering
      the 'a' format on Python 3.

    * Add multiple checks for PEP 3101 advanced string formatting:
      'bad-format-string', 'missing-format-argument-key',
      'unused-format-string-argument', 'format-combined-specification',
      'missing-format-attribute' and 'invalid-format-index'.

    * Issue broad-except and bare-except even if the number
      of except handlers is different than 1. Fixes issue #113.

    * Issue attribute-defined-outside-init for all cases, not just
      for the last assignment. Closes issue #262.

    * Emit 'not-callable' when calling properties. Closes issue #268.

    * Fix a false positive with unbalanced iterable unpacking,
      when encountering starred nodes. Closes issue #273.

    * Add new checks, 'invalid-slice-index' and 'invalid-sequence-index'
      for invalid sequence and slice indices.

    * Add 'assigning-non-slot' warning, which detects assignments to
      attributes not defined in slots.

    * Don't emit 'no-name-in-module' for ignored modules.
      Closes issue #223.

    * Fix an 'unused-variable' false positive, where the variable is
      assigned through an import. Closes issue #196.

    * Definition order is considered for classes, function arguments
      and annotations. Closes issue #257.

    * Don't emit 'unused-variable' when assigning to a nonlocal.
      Closes issue #275.

    * Do not let ImportError propagate from the import checker, leading to crash
      in some namespace package related cases. Closes issue #203.

    * Don't emit 'pointless-string-statement' for attribute docstrings.
      Closes issue #193.

    * Use the proper mode for pickle when opening and writing the stats file.
      Closes issue #148.

    * Don't emit hidden-method message when the attribute has been
      monkey-patched, you're on your own when you do that.

    * Only emit attribute-defined-outside-init for definition within the same
      module as the offended class, avoiding to mangle the output in some cases.

    * Don't emit 'unnecessary-lambda' if the body of the lambda call contains
      call chaining. Closes issue #243.

    * Don't emit 'missing-docstring' when the actual docstring uses `.format`.
      Closes issue #281.


What's New in Pylint 1.2.1?
===========================

Release date: 2014-04-30

    * Restore the ability to specify the init-hook option via the
      configuration file, which was accidentally broken in 1.2.0.

    * Add a new warning [bad-continuation] for badly indentend continued
      lines.

    * Emit [assignment-from-none] when the function contains bare returns.
      Fixes BitBucket issue #191.

    * Added a new warning for closing over variables that are
      defined in loops. Fixes Bitbucket issue #176.

    * Do not warn about \u escapes in string literals when Unicode literals
      are used for Python 2.*. Fixes BitBucket issue #151.

    * Extend the checking for unbalanced-tuple-unpacking and
      unpacking-non-sequence to instance attribute unpacking as well.

    * Fix explicit checking of python script (1.2 regression, #219)

    * Restore --init-hook, renamed accidentally into --init-hooks in 1.2.0
      (#211)

    * Add 'indexing-exception' warning, which detects that indexing
      an exception occurs in Python 2 (behaviour removed in Python 3).


What's New in Pylint 1.2.0?
===========================

Release date: 2014-04-18

    * Pass the current python paths to pylint process when invoked via
      epylint.  Fixes BitBucket issue #133.

    * Add -i / --include-ids and -s / --symbols back as completely ignored
      options. Fixes BitBucket issue #180.

    * Extend the number of cases in which logging calls are detected. Fixes
      bitbucket issue #182.

    * Improve pragma handling to not detect pylint:* strings in non-comments.
      Fixes BitBucket issue #79.

    * Do not crash with UnknownMessage if an unknown message ID/name appears
      in disable or enable in the configuration. Patch by Cole Robinson.
      Fixes bitbucket issue #170.

    * Add new warning 'eval-used', checking that the builtin function `eval`
      was used.

    * Make it possible to show a naming hint for invalid name by setting
      include-naming-hint. Also make the naming hints configurable. Fixes
      BitBucket issue #138.

    * Added support for enforcing multiple, but consistent name styles for
      different name types inside a single module; based on a patch written
      by morbo@google.com.

    * Also warn about empty docstrings on overridden methods; contributed
      by sebastianu@google.com.

    * Also inspect arguments to constructor calls, and emit relevant
      warnings; contributed by sebastianu@google.com.

    * Added a new configuration option logging-modules to make the list
      of module names that can be checked for 'logging-not-lazy' et. al.
      configurable; contributed by morbo@google.com.

    * ensure init-hooks is evaluated before other options, notably load-plugins
      (#166)

    * Python 2.5 support restored: fixed small issues preventing pylint to run
      on python 2.5. Bitbucket issues #50 and #62.

    * bitbucket #128: pylint doesn't crash when looking
      for used-before-assignment in context manager
      assignments.

    * Add new warning, 'bad-reversed-sequence', for checking that the
      reversed() builtin receive a sequence (implements __getitem__ and __len__,
      without being a dict or a dict subclass) or an instance which implements
      __reversed__.

    * Mark `file` as a bad function when using python2 (closes #8).

    * Add new warning 'bad-exception-context', checking
      that `raise ... from ...` uses a proper exception context
      (None or an exception).

    * Enhance the check for 'used-before-assignment' to look
      for 'nonlocal' uses.

    * Emit 'undefined-all-variable' if a package's __all__
      variable contains a missing submodule (closes #126).

    * Add a new warning 'abstract-class-instantiated' for checking
      that abstract classes created with `abc` module and
      with abstract methods are instantied.

    * Do not warn about 'return-arg-in-generator' in Python 3.3+.

    * Do not warn about 'abstract-method' when the abstract method
      is implemented through assignment (#155).

    * Improve cyclic import detection in the case of packages, patch by Buck
      Golemon

    * Add new warnings for checking proper class __slots__:
      `invalid-slots-object` and `invalid-slots`.

    * Search for rc file in `~/.config/pylintrc` if `~/.pylintrc`
      doesn't exists (#121)

    * Don't register the newstyle checker w/ python >= 3

    * Fix unused-import false positive w/ augment assignment (#78)

    * Fix access-member-before-definition false negative wrt aug assign (#164)

    * Do not attempt to analyze non python file, eg .so file (#122)


What's New in Pylint 1.1.0?
===========================

Release date: 2013-12-22

    * Add new check for use of deprecated pragma directives "pylint:disable-msg"
      or "pylint:enable-msg" (I0022, deprecated-pragma) which was previously
      emitted as a regular warn().

    * Avoid false used-before-assignment for except handler defined
      identifier used on the same line (#111).

    * Combine 'no-space-after-operator', 'no-space-after-comma' and
      'no-space-before-operator' into a new warning 'bad-whitespace'.

    * Add a new warning 'superfluous-parens' for unnecessary
      parentheses after certain keywords.

    * Fix a potential crash in the redefine-in-handler warning
      if the redefined name is a nested getattr node.

    * Add a new option for the multi-statement warning to
      allow single-line if statements.

    * Add 'bad-context-manager' error, checking that '__exit__'
      special method accepts the right number of arguments.

    * Run pylint as a python module 'python -m pylint' (anatoly techtonik).

    * Check for non-exception classes inside an except clause.

    * epylint support options to give to pylint after the file to analyze and
      have basic input validation (bitbucket #53 and #54), patches provided by
      felipeochoa and Brian Lane.

    * Added a new warning, 'non-iterator-returned', for non-iterators
      returned by '__iter__'.

    * Add new checks for unpacking non-sequences in assignments
      (unpacking-non-sequence) as well as unbalanced tuple unpacking
      (unbalanced-tuple-unpacking).

    * useless-else-on-loop not emitted if there is a break in the
      else clause of inner loop (#117).

    * don't mark `input` as a bad function when using python3 (#110).

    * badly-implemented-container caused several problems in its
      current implementation. Deactivate it until we have something
      better. See #112 for instance.

    * Use attribute regexp for properties in python3, as in python2

    * Create the PYLINTHOME directory when needed, it might fail and lead to
      spurious warnings on import of pylint.config.

    * Fix setup.py so that pylint properly install on Windows when using python3

    * Various documentation fixes and enhancements

    * Fix issue #55 (false-positive trailing-whitespace on Windows)


What's New in Pylint 1.0.0?
===========================

Release date: 2013-08-06


    * Add check for the use of 'exec' function

    * New --msg-template option to control output, deprecating "msvc" and
      "parseable" output formats as well as killing `--include-ids` and `--symbols`
      options

    * Do not emit [fixme] for every line if the config value 'notes'
      is empty, but [fixme] is enabled.

    * Emit warnings about lines exceeding the column limit when
      those lines are inside multiline docstrings.

    * Do not double-check parameter names with the regex for parameters and
      inline variables.

    * Added a new warning missing-final-newline (C0304) for files missing
      the final newline.

    * Methods that are decorated as properties are now treated as attributes
      for the purposes of name checking.

    * Names of derived instance class member are not checked any more.

    * Names in global statements are now checked against the regular
      expression for constants.

    * For toplevel name assignment, the class name regex will be used if
      pylint can detect that value on the right-hand side is a class
      (like collections.namedtuple()).

    * Simplified invalid-name message

    * Added a new warning invalid-encoded-data (W0512) for files that
      contain data that cannot be decoded with the specified or
      default encoding.

    * New warning bad-open-mode (W1501) for calls to open (or file) that
      specify invalid open modes (Original implementation by Sasha Issayev).

    * New warning old-style-class (C1001) for classes that do not have any
      base class.

    * Add new name type 'class_attribute' for attributes defined
      in class scope. By default, allow both const and variable names.

    * New warning trailing-whitespace (C0303) that warns about
      trailing whitespace.

    * Added a new warning unpacking-in-except (W0712) about unpacking
      exceptions in handlers, which is unsupported in Python 3.

    * Add a configuration option for missing-docstring to
      optionally exempt short functions/methods/classes from
      the check.

    * Add the type of the offending node to missing-docstring
      and empty-docstring.

    * New utility classes for per-checker unittests in testutils.py

    * Do not warn about redefinitions of variables that match the
      dummy regex.

    * Do not treat all variables starting with _ as dummy variables,
      only _ itself.

    * Make the line-too-long warning configurable by adding a regex for lines
      for with the length limit should not be enforced

    * Do not warn about a long line if a pylint disable
      option brings it above the length limit

    * Do not flag names in nested with statements as undefined.

    * Added a new warning 'old-raise-syntax' for the deprecated syntax
      raise Exception, args

    * Support for PEP 3102 and new missing-kwoa (E1125) message for missing
      mandatory keyword argument (logilab.org's #107788)

    * Fix spelling of max-branchs option, now max-branches

    * Added a new base class and interface for checkers that work on the
      tokens rather than the syntax, and only tokenize the input file
      once.

    * Follow astng renaming to astroid

    * bitbucket #37: check for unbalanced unpacking in assignments

    * bitbucket #25: fix incomplete-protocol false positive for read-only
      containers like tuple

    * bitbucket #16: fix False positive E1003 on Python 3 for argument-less super()

    * bitbucket #6: put back documentation in source distribution

    * bitbucket #15: epylint shouldn't hang anymore when there is a large
      output on pylint'stderr

    * bitbucket #7: fix epylint w/ python3

    * bitbucket #3: remove string module from the default list of deprecated
      modules


What's New in Pylint 0.28.0?
============================

Release date: 2013-04-25

    * bitbucket #1: fix "dictionary changed size during iteration" crash

    * #74013: new E1310[bad-str-strip-call] message warning when a call to a
      {l,r,}strip method contains duplicate characters (patch by Torsten Marek)

    * #123233: new E0108[duplicate-argument-name] message reporting duplicate
      argument names

    * #81378: emit W0120[useless-else-on-loop] for loops without break

    * #124660: internal dependencies should not appear in external dependencies
      report

    * #124662: fix name error causing crash when symbols are included in output
      messages

    * #123285: apply pragmas for warnings attached to lines to physical source
      code lines

    * #123259: do not emit E0105 for yield expressions inside lambdas

    * #123892: don't crash when attempting to show source code line that can't
      be encoded with the current locale settings

    * Simplify checks for dangerous default values by unifying tests for all
      different mutable compound literals.

    * Improve the description for E1124[redundant-keyword-arg]


What's New in Pylint 0.27.0?
============================

Release date: 2013-02-26

    * #20693: replace pylint.el by Ian Eure version (patch by J.Kotta)

    * #105327: add support for --disable=all option and deprecate the
      'disable-all' inline directive in favour of 'skip-file' (patch by
      A.Fayolle)

    * #110840: add messages I0020 and I0021 for reporting of suppressed
      messages and useless suppression pragmas. (patch by Torsten Marek)

    * #112728: add warning E0604 for non-string objects in __all__
      (patch by Torsten Marek)

    * #120657: add warning W0110/deprecated-lambda when a map/filter
      of a lambda could be a comprehension (patch by Martin Pool)

    * #113231: logging checker now looks at instances of Logger classes
      in addition to the base logging module. (patch by Mike Bryant)

    * #111799: don't warn about octal escape sequence, but warn about \o
      which is not octal in Python (patch by Martin Pool)

    * #110839: bind <F5> to Run button in pylint-gui

    * #115580: fix erroneous W0212 (access to protected member) on super call
      (patch by Martin Pool)

    * #110853: fix a crash when an __init__ method in a base class has been
      created by assignment rather than direct function definition (patch by
      Torsten Marek)

    * #110838: fix pylint-gui crash when include-ids is activated (patch by
      Omega Weapon)

    * #112667: fix emission of reimport warnings for mixed imports and extend
      the testcase (patch by Torsten Marek)

    * #112698: fix crash related to non-inferable __all__ attributes and
      invalid __all__ contents (patch by Torsten Marek)

    * Python 3 related fixes:

    * #110213: fix import of checkers broken with python 3.3, causing
        "No such message id W0704" breakage

    * #120635: redefine cmp function used in pylint.reporters

    * Include full warning id for I0020 and I0021 and make sure to flush
      warnings after each module, not at the end of the pylint run.
      (patch by Torsten Marek)

    * Changed the regular expression for inline options so that it must be
      preceded by a # (patch by Torsten Marek)

    * Make dot output for import graph predictable and not depend
      on ordering of strings in hashes. (patch by Torsten Marek)

    * Add hooks for import path setup and move pylint's sys.path
      modifications into them. (patch by Torsten Marek)


What's New in Pylint 0.26.0?
============================

Release date: 2012-10-05

    * #106534: add --ignore-imports option to code similarity checking
      and 'symilar' command line tool (patch by Ry4an Brase)

    * #104571: check for anomalous backslash escape, introducing new
      W1401 and W1402 messages (patch by Martin Pool)

    * #100707: check for boolop being used as exception class, introducing
      new W0711 message (patch by Tim Hatch)

    * #4014: improve checking of metaclass methods first args, introducing
      new C0204 message (patch by lothiraldan@gmail.com finalized by sthenault)

    * #4685: check for consistency of a module's __all__ variable,
      introducing new E0603 message

    * #105337: allow custom reporter in output-format (patch by Kevin Jing Qiu)

    * #104420: check for protocol completness and avoid false R0903
      (patch by Peter Hammond)

    * #100654: fix grammatical error for W0332 message (using 'l' as
      long int identifier)

    * #103656: fix W0231 false positive for missing call to object.__init__
      (patch by lothiraldan@gmail.com)

    * #63424: fix similarity report disabling by properly renaming it to RP0801

    * #103949: create a console_scripts entry point to be used by
      easy_install, buildout and pip

    * fix cross-interpreter issue (non compatible access to __builtins__)

    * stop including tests files in distribution, they causes crash when
      installed with python3 (#72022, #82417, #76910)


What's New in Pylint 0.25.2?
============================

Release date: 2012-07-17

    * #93591: Correctly emit warnings about clobbered variable names when an
      except handler contains a tuple of names instead of a single name.
      (patch by tmarek@google.com)

    * #7394: W0212 (access to protected member) not emitted on assigments
      (patch by lothiraldan@gmail.com)

    * #18772; no prototype consistency check for mangled methods (patch by
      lothiraldan@gmail.com)

    * #92911: emit W0102 when sets are used as default arguments in functions
      (patch by tmarek@google.com)

    * #77982: do not emit E0602 for loop variables of comprehensions
      used as argument values inside a decorator (patch by tmarek@google.com)

    * #89092: don't emit E0202 (attribute hiding a method) on @property methods

    * #92584: fix pylint-gui crash due to internal API change

    * #87192: fix crash when decorators are accessed through more than one dot
      (for instance @a.b is fine, @a.b.c crash)

    * #88914: fix parsing of --generated-members options, leading to crash
      when using a regexp value set

    * fix potential crashes with utils.safe_infer raising InferenceError


What's New in Pylint 0.25.1?
============================

Release date: 2011-12-08

    * #81078: Warn if names in  exception handlers clobber overwrite
      existing names (patch by tmarek@google.com)

    * #81113: Fix W0702 messages appearing with the wrong line number.
      (patch by tmarek@google.com)

    * #50461, #52020, #51222: Do not issue warnings when using 2.6's
      property.setter/deleter functionality (patch by dneil@google.com)

    * #9188, #4024: Do not trigger W0631 if a loop variable is assigned
      in the else branch of a for loop.


What's New in Pylint 0.25.0?
============================

Release date: 2011-10-7

    * #74742: make allowed name for first argument of class method configurable
      (patch by Google)

    * #74087: handle case where inference of a module return YES; this avoid
      some cases of "TypeError: '_Yes' object does not support indexing" (patch
      by Google)

    * #74745: make "too general" exception names configurable (patch by Google)

    * #74747: crash occurs when lookup up a special attribute in class scope
      (patch by google)

    * #76920: crash if on eg "pylint --rcfile" (patch by Torsten Marek)

    * #77237: warning for E0202 may be very misleading

    * #73941: HTML report messages table is badly rendered


What's New in Pylint 0.24.0?
============================

Release date: 2011-07-18

    * #69738: add regular expressions support for "generated-members"

    * ids of logging and string_format checkers have been changed:
      logging: 65 -> 12, string_format: 99 -> 13
      Also add documentation to say that ids of range 1-50 shall be reserved
      to pylint internal checkers

    * #69993: Additional string format checks for logging module:
      check for missing arguments, too many arguments, or invalid string
      formats in the logging checker module. Contributed by Daniel Arena

    * #69220: add column offset to the reports. If you've a custom reporter,
      this change may break it has now location gain a new item giving the
      column offset.

    * #60828: Fix false positive in reimport check

    * #70495: absolute imports fail depending on module path (patch by Jacek Konieczny)

    * #22273: Fix --ignore option documentation to match reality


What's New in Pylint 0.23.0?
============================

Release date: 2011-01-11

    * documentation update, add manpages

    * several performance improvements

    * finalize python3 support

    * new W0106 warning 'Expression "%s" is assigned to nothing'

    * drop E0501 and E0502 messages about wrong source encoding: not anymore
      interesting since it's a syntax error for python >= 2.5 and we now only
      support this python version and above.

    * don't emit W0221 or W0222 when methods as variable arguments (eg \*arg
      and/or \*\*args). Patch submitted by Charles Duffy.


What's New in Pylint 0.22.0?
============================

Release date: 2010-11-15

    * python versions: minimal python3.x support; drop python < 2.5 support


What's New in Pylint 0.21.4?
============================

Release date: 2010-10-27

    * fix #48066: pylint crashes when redirecting output containing non-ascii characters

    * fix #19799: "pylint -blah" exit with status 2

    * update documentation


What's New in Pylint 0.21.3?
============================

Release date: 2010-09-28

    * restored python 2.3 compatibility. Along with logilab-astng
      0.21.3 and logilab-common 0.52, this will much probably be the
      latest release supporting python < 2.5.


What's New in Pylint 0.21.2?
============================

Release date: 2010-08-26

    * fix #36193: import checker raise exception on cyclic import

    * fix #28796: regression in --generated-members introduced pylint 0.20

    * some documentation cleanups


What's New in Pylint 0.21.1?
============================

Release date: 2010-06-04

    * fix #28962: pylint crash with new options, due to missing stats data while
      writing the Statistics by types report

    * updated man page to 0.21 or greater command line usage (fix debian #582494)


What's New in Pylint 0.21.0?
============================

Release date: 2010-05-11

    * command line updated (closes #9774, #9787, #9992, #22962):

    * all enable-* / disable-* options have been merged into --enable / --disable

    * BACKWARD INCOMPATIBLE CHANGE: short name of --errors-only becomes -E, -e being
      affected to --enable

    * pylint --help output much simplified, with --long-help available to get the
      complete one

    * revisited gui, thanks to students from Toronto university (they are great
      contributors to this release!)

    * fix #21591: html reporter produces no output if reports is set to 'no'

    * fix #4581: not Missing docstring (C0111) warning if a method is overridden

    * fix #4683: Non-ASCII characters count double if utf8 encode

    * fix #9018: when using defining-attr-method, method order matters

    * fix #4595: Comma not followed by a space should not occurs on trailing comma
      in list/tuple/dict definition

    * fix #22585: [Patch] fix man warnings for pyreverse.1 manpage

    * fix #20067: AttributeError: 'NoneType' object has no attribute 'name' with with



What's New in Pylint 0.20.0?
============================

Release date: 2010-03-01

    * fix #19498: fix windows batch file

    * fix #19339: pylint.el : non existing py-mod-map
      (closes Debian Bug report logs - #475939)

    * implement #18860, new W0199 message on assert (a, b)

    * implement #9776, 'W0150' break or return statement in finally block may
      swallow exception.

    * fix #9263, __init__ and __new__ are checked for unused arguments

    * fix #20991, class scope definitions ignored in a genexpr

    * fix #5975, Abstract intermediate class not recognized as such

    * fix #5977, yield and return statement have their own counters, no more R0911
      (Too many return statements) when a function have many yield stamtements

    * implement #5564, function / method arguments with leading "_" are ignored in
      arguments / local variables count.

    * implement #9982, E0711 specific error message when raising NotImplemented

    * remove --cache-size option


What's New in Pylint 0.19.0?
============================

Release date: 2009-12-18

    * implement #18947, #5561: checker for function arguments

    * include James Lingard string format checker

    * include simple message (ids) listing by Vincent Ferotin (#9791)

    * --errors-only does not hide fatal error anymore

    * include james Lingard patches for ++/-- and duplicate key in dicts

    * include James Lingard patches for function call arguments checker

    * improved flymake code and doc provided by Derek Harland

    * refactor and fix the imports checker

    * fix #18862: E0601 false positive with lambda functions

    * fix #8764: More than one statement on a single line false positive with
      try/except/finally

    * fix #9215: false undefined variable error in lambda function

    * fix for w0108 false positive (Nathaniel)

    * fix test/fulltest.sh

    * #5821 added a utility function to run pylint in another process (patch provide by Vincent Ferotin)


What's New in Pylint 0.18.0?
============================

Release date: 2009-03-25

    * tests ok with python 2.4, 2.5, 2.6. 2.3 not tested

    * fix #8687, W0613 false positive on inner function

    * fix #8350, C0322 false positive on multi-line string

    * fix #8332: set E0501 line no to the first line where non ascii character
      has been found

    * avoid some E0203 / E0602 false negatives by detecting respectively
      AttributeError / NameError

    * implements #4037: don't issue W0142 (* or ** magic) when they are barely
      passed from */** arguments

    * complete #5573: more complete list of special methods, also skip W0613
      for python internal method

    * don't show information messages by default

    * integration of Yuen Ho Wong's patches on emacs lisp files


What's New in Pylint 0.17.0?
============================

Release date: 2009-03-19

    * semicolon check : move W0601 to W0301

    * remove rpython : remove all rpython checker, modules and tests

    * astng 0.18 compatibility: support for _ast module modifies interfaces


What's New in Pylint 0.16.0?
============================

Release date: 2009-01-28

    * change [en|dis]able-msg-cat options: only accept message categories
      identified by their first letter (eg IRCWEF) without the need for comma
      as separator

    * add epylint.bat script to fix Windows installation

    * setuptools/easy_install support

    * include a modified version of Maarten ter Huurne patch to avoid W0613
      warning on arguments from overridden method

    * implement #5575  drop dumb W0704 message) by adding W0704 to ignored
      messages by default

    * new W0108 message, checking for suspicious lambda (provided by  Nathaniel
      Manista)

    * fix W0631, false positive reported by Paul Hachmann

    * fix #6951: false positive with W0104

    * fix #6949

    * patches by Mads Kiilerich:

    * implement #4691, make pylint exits with a non zero return
      status if any messages other then Information are issued

    * fix #3711, #5626 (name resolution bug w/ decorator and class members)

    * fix #6954


What's New in Pylint 0.15.2?
============================

Release date: 2008-10-13

    * fix #5672: W0706 weirdness ( W0706 removed )

    * fix #5998: documentation points to wrong url for mailing list

    * fix #6022: no error message on wrong module names

    * fix #6040: pytest doesn't run test/func_test.py


What's New in Pylint 0.15.1?
============================

Release date: 2008-09-15

    * fix #4910: default values are missing in manpage

    * fix #5991: missing files in 0.15.0 tarball

    * fix #5993: epylint should work with python 2.3


What's New in Pylint 0.15.0?
============================

Release date: 2008-09-10

    * include pyreverse package and class diagram generation

    * included Stefan Rank's patch to deal with 2.4 relative import

    * included Robert Kirkpatrick's tutorial and typos fixes

    * fix bug in reenabling message

    * fix #2473: invoking pylint on __init__.py (hopefully)

    * typecheck: acquired-members option has been dropped in favor of the more
      generic generated-members option. If the zope option is set, the behaviour
      is now to add some default values to generated-members.

    * flymake integration: added bin/epylint and elisp/pylint-flymake.el


What's New in Pylint 0.14.0?
============================

Release date: 2008-01-14

    * fix #3733: Messages (dis)appear depending on order of file names

    * fix #4026: pylint.el should require compile

    * fix a bug in colorized reporter, spotted by Dave Borowitz

    * applied patch from Stefan Rank to avoid W0410 false positive when
      multiple "from __future__" import statements

    * implement #4012: flag back tick as deprecated (new W0333 message)

    * new ignored-class option on typecheck checker allowing to skip members
      checking based on class name (patch provided by Thomas W Barr)


What's New in Pylint 0.13.2?
============================

Release date: 2007-06-07

    * fix disable-checker option so that it won't accidentally enable the
      rpython checker which is disabled by default

    * added note about the gedit plugin into documentation



What's New in Pylint 0.13.1?
============================

Release date: 2007-03-02

    * fix some unexplained 0.13.0 packaging issue which led to a bunch of
      files missing from the distribution



What's New in Pylint 0.13.0?
============================

Release date: 2007-02-28

    * new RPython (Restricted Python) checker for PyPy fellow or people
      wanting to get a compiled version of their python program using the
      translator of the PyPy project. For more information about PyPy or
      RPython, visit http://codespeak.net/pypy/

    * new E0104 and E0105 messages introduced to respectively warn about
      "return" and "yield" outside function or method

    * new E0106 message when "yield" and "return something" are mixed in a
      function or method

    * new W0107 message for unnecessary pass statement

    * new W0614 message to differentiate between unused `import X` and
      unused `from X import *` (#3209, patch submitted by Daniel Drake)

    * included Daniel Drake's patch to have a different message E1003 instead of
      E1001 when a missing member is found but an inference failure has been
      detected

    * msvs reporter for Visual Studio line number reporting (#3285)

    * allow disable-all option inline (#3218, patch submitted by Daniel Drake)

    * --init-hook option to call arbitrary code necessary to set
      environment (eg sys.path) (#3156)

    * One more Daniel's patch fixing a command line option parsing
      problem, this'll definitely be the DDrake release :)

    * fix #3184: crashes on "return" outside function

    * fix #3205: W0704 false positive

    * fix #3123: W0212 false positive on static method

    * fix #2485: W0222 false positive

    * fix #3259: when a message is explicitly enabled, check the checker
      emitting it is enabled


What's New in Pylint 0.12.2?
============================

Release date: 2006-11-23

    * fix #3143: W0233 bug w/ YES objects

    * fix #3119: Off-by-one error counting lines in a file

    * fix #3117: ease sys.stdout overriding for reporters

    * fix #2508: E0601 false positive with lambda

    * fix #3125: E1101 false positive and a message duplication. Only the last part
      is actually fixed since the initial false positive is due to dynamic setting of
      attributes on the decimal.Context class.

    * fix #3149: E0101 false positives and introduced E0100 for generator __init__
      methods

    * fixed some format checker false positives


What's New in Pylint 0.12.1?
============================


Release date: 2006-09-25

    * fixed python >= 2.4 format false positive with multiple lines statement

    * fixed some 2.5 issues

    * fixed generator expression scope bug (depends on astng 0.16.1)

    * stop requiring __revision__


What's New in Pylint 0.12.0?
============================


Release date: 2006-08-10

    * usability changes:

        * parseable, html and color options are now handled by a single
          output-format option

        * enable-<checkerid> and disable-all options are now handled by
          two (exclusive) enable-checker and disable-checker options
          taking a comma separated list of checker names as value

        * renamed debug-mode option to errors-only

    * started a reference user manual

    * new W0212 message for access to protected member from client code
      (close #14081)

    * new W0105 and W0106 messages extracted from W0104 (statement seems
      to have no effect) respectively when the statement is actually string
      (that's sometimes used instead of comments for documentation) or an
      empty  statement generated by a useless semicolon

    * reclassified W0302 to C0302

    * fix so that global messages are not anymore connected to the last
      analyzed module (close #10106)

    * fix some bugs related to local disabling of messages

    * fix cr/lf pb when generating the rc file on windows platforms


What's New in Pylint 0.11.0?
============================

Release date: 2006-04-19

    * fix crash caused by the exceptions checker in some case

    * fix some E1101 false positive with abstract method or classes defining
      __getattr__

    * dirty fix to avoid "_socketobject" has not "connect" member. The actual
      problem is that astng isn't able to understand the code used to create
      socket.socket object with exec

    * added an option in the similarity checker to ignore docstrings, enabled
      by default

    * included patch from Benjamin Niemann to allow block level
      enabling/disabling of messages


What's New in Pylint 0.10.0?
============================

Release date: 2006-03-06

    * WARNING, this release include some configuration changes (see below),
      so you may have to check and update your own configuration file(s) if
      you use one

    * this release require the 0.15 version of astng or superior (it will save
      you a lot of pylint crashes...)

    * W0705 has been reclassified to E0701, and is now detecting more
      inheriting problem, and a false positive when empty except clause is
      following an Exception catch has been fixed (close #10422)

    * E0212 and E0214 (metaclass/class method should have mcs/cls as first
      argument have been reclassified to C0202 and C0203 since this not as
      well established as "self" for instance method (E0213)

    * W0224 has been reclassified into F0220 (failed to resolve interfaces
      implemented by a class)

    * a new typecheck checker, introducing the following checks:

        - E1101, access to unexistent member (implements #10430), remove
          the need of E0201 and so some options has been moved from the
          classes checker to this one
        - E1102, calling a non callable object
        - E1111 and W1111 when an assignment is done on a function call but the
          inferred function returns None (implements #10431)

    * change in the base checker:

        - checks module level and instance attribute names (new const-rgx
          and attr-rgx configuration option) (implements #10209  and
          #10440)
        - list comprehension and generator expression variables have their
          own regular expression  (the inlinevar-rgx option) (implements
          #9146)
        - the C0101 check with its min-name-length option has
          been removed (this can be specified in the regxp after all...)
        - W0103 and W0121 are now handled by the variables checker
          (W0103 is now W0603 and W0604 has been splitted into different messages)
        - W0131 and W0132 messages  have been reclassified to C0111 and
          C0112 respectively
        - new W0104 message on statement without effect

    * regexp support for dummy-variables (dummy-variables-rgx option
      replace dummy-variables) (implements #10027)

    * better global statement handling, see W0602, W0603, W0604 messages
      (implements #10344 and #10236)

    * --debug-mode option, disabling all checkers without error message
      and filtering others to only display error

    * fixed some R0201 (method could be a function) false positive


What's New in Pylint 0.9.0?
============================

Release date: 2006-01-10

    * a lot of updates to follow astng 0.14 API changes, so install
      logilab-astng  0.14 or greater before using this version of pylint

    * checker number 10 ! newstyle will search for problems regarding old
      style / new style classes usage problems (rely on astng 0.14 new
      style detection feature)

    * new 'load-plugins' options to load additional pylint plugins (usable
      from the command line or from a configuration file) (implements
      #10031)

    * check if a "pylintrc" file exists in the current working directory
      before using the one specified in the PYLINTRC environment variable
      or the default ~/.pylintrc or /etc/pylintrc

    * fixed W0706 (Identifier used to raise an exception is assigned...)
      false positive and reraising a catched exception instance

    * fixed E0611 (No name get in module blabla) false positive when accessing
      to a class'__dict__

    * fixed some E0203 ("access to member before its definition") false
      positive

    * fixed E0214 ("metaclass method first argument should be mcs) false
      positive with staticmethod used on a metaclass

    * fixed packaging which was missing the test/regrtest_data directory

    * W0212 (method could be a function) has been reclassified in the
      REFACTOR category as R0201, and is no more considerer when a method
      overrides an abstract method from an ancestor class

    * include module name in W0401 (wildcard import), as suggested by
      Amaury

    * when using the '--parseable', path are written relative to the
      current working directory if in a sub-directory of it (#9789)

    * 'pylint --version' shows logilab-astng and logilab-common versions

    * fixed pylint.el to handle space in file names

    * misc lint style fixes


What's New in Pylint 0.8.1?
============================


Release date: 2005-11-07

    * fix "deprecated module" false positive when the code imports a
      module whose name starts with a deprecated module's name (close
      #10061)

    * fix "module has no name __dict__" false positive (close #10039)

    * fix "access to undefined variable __path__" false positive (close
      #10065)

    * fix "explicit return in __init__" false positive when return is
      actually in an inner function (close #10075)


What's New in Pylint 0.8.0?
============================

Release date: 2005-10-21

    * check names imported from a module exists in the module (E0611),
      patch contributed by Amaury Forgeot d'Arc

    * print a warning (W0212) for methods that could be a function
      (implements #9100)

    * new --defining-attr-methods option on classes checker

    * new --acquired-members option on the classes checker, used when
      --zope=yes to avoid false positive on acquired attributes (listed
      using this new option) (close #8616)

    * generate one E0602 for each use of an undefined variable
      (previously, only one for the first use but not for the following)
      (implements #1000)

    * make profile option saveable

    * fix Windows .bat file,  patch contributed by Amaury Forgeot d'Arc

    * fix one more false positive for E0601 (access before definition)
      with for loop such as "for i in range(10): print i" (test
      func_noerror_defined_and_used_on_same_line)

    * fix false positive for E0201 (undefined member) when accessing to
      __name__ on a class object

    * fix astng checkers traversal order

    * fix bug in format checker when parsing a file from a platform
      using different new line characters (close #9239)

    * fix encoding detection regexp

    * fix --rcfile handling (support for --rcfile=file, close #9590)


What's New in Pylint 0.7.0?
============================


Release date: 2005-05-27

    * WARNING: pylint is no longer a logilab subpackage. Users may have to
      manually remove the old logilab/pylint directory.

    * introduce a new --additional-builtins option to handle user defined
      builtins

    * --reports option has now -r as short alias, and -i for --include-ids

    * fix a bug in the variables checker which may causing some false
      positives when variables are defined and used within the same
      statement (test func_noerror_defined_and_used_on_same_line)

    * this time, real fix of the "disable-msg in the config file" problem,
      test added to unittest_lint

    * fix bug with --list-messages and python -OO

    * fix possible false positive for W0201


What's New in Pylint 0.6.4?
===========================


Release date: 2005-04-14

    * allow to parse files without extension when a path is given on the
      command line (test noext)

    * don't fail if we are unable to read an inline option  (e.g. inside a
      module), just produce an information message (test func_i0010)

    * new message E0103 for break or continue outside loop (close #8883,
      test func_continue_not_in_loop)

    * fix bug in the variables checker, causing non detection of some
      actual name error (close #8884, test
      func_nameerror_on_string_substitution)

    * fix bug in the classes checker which was making pylint crash if
      "object" is assigned in a class inheriting from it (test
      func_noerror_object_as_class_attribute)

    * fix problem with the similar checker when related options are
      defined in a configuration file

    * new --generate-man option to generate pylint's man page (require the
      latest logilab.common (>= 0.9.3)

    * packaged (generated...) man page


What's New in Pylint 0.6.3?
===========================

Release date: 2005-02-24

    * fix scope problem which may cause false positive and true negative
      on E0602

    * fix problem with some options such as disable-msg causing error when
      they are coming from the configuration file


What's New in Pylint 0.6.2?
============================


Release date: 2005-02-16

    * fix false positive on E0201 ("access to undefined member") with
      metaclasses

    * fix false positive on E0203 ("access to member before its
      definition") when attributes are defined in a parent class

    * fix false positive on W0706 ("identifier used to raise an exception
      assigned to...")

    * fix interpretation of "\t" as value for the indent-string
      configuration variable

    * fix --rcfile so that --rcfile=pylintrc (only --rcfile pylintrc was
      working in earlier release)

    * new raw checker example in the examples/ directory


What's New in Pylint 0.6.1?
===========================

Release date: 2005-02-04

    * new --rcfile option to specify the configuration file without the
      PYLINTRC environment variable

    * added an example module for a custom pylint checker (see the
      example/ directory)

    * some fixes to handle fixes in common 0.9.1 (should however still working
      with common 0.9.0, even if upgrade is recommended)


What's New in Pylint 0.6.0?
===========================

Release date: 2005-01-20

    * refix pylint emacs mode

    * no more traceback when just typing "pylint"

    * fix a bug which may cause crashes on resolving parent classes

    * fix problems with the format checker: don't chock on files
      containing multiple CR, avoid C0322, C0323, C0324 false positives
      with triple quoted string with quote inside

    * correctly detect access to member defined latter in __init__ method

    * now depends on common 0.8.1 to fix problem with interface resolution
      (close #8606)

    * new --list-msgs option describing available checkers and their
      messages

    * added windows specific documentation to the README file, contributed
      by Brian van den Broek

    * updated doc/features.txt (actually this file is now generated using
      the --list-msgs option), more entries into the FAQ

    * improved tests coverage


What's New in Pylint 0.5.0?
===========================

Release date: 2004-10-19

    * avoid importing analyzed modules !

    * new Refactor and Convention message categories. Some Warnings have been
      remaped into those new categories

    * added "similar", a tool to find copied and pasted lines of code,
      both using a specific command line tool and integrated as a
      pylint's checker

    * imports checker may report import dependencies as a dot graph

    * new checker regrouping most Refactor detection (with some new metrics)

    * more command line options storable in the configuration file

    * fix bug with total / undocumented number of methods


What's New in Pylint 0.4.2?
===========================

Release date: 2004-07-08

    * fix pylint emacs mode

    * fix classes checkers to handler twisted interfaces


What's New in Pylint 0.4.1?
===========================

Release date: 2004-05-14

    * fix the setup.py script to allow bdist_winst (well, the generated
      installer has not been tested...) with the necessary
      logilab/__init__.py file

    * fix file naming convention as suggested by Andreas Amoroso

    * fix stupid crash bug with bad method names


What's New in Pylint 0.4.0?
===========================

Release date: 2004-05-10

    * fix file path with --parsable

    * --parsable option has been renamed to --parseable

    * added patch from Andreas Amoroso to output message to files instead
      of standard output

    * added Run to the list of correct variable names

    * fix variable names regexp and checking of local classes names

    * some basic handling of metaclasses

    * no-docstring-rgx apply now on classes too

    * new option to specify a different regexp for methods than for
      functions

    * do not display the evaluation report when no statements has been
      analysed

    * fixed crash with a class nested in a method

    * fixed format checker to deals with triple quoted string and
      lines with code and comment mixed

    * use logilab.common.ureports to layout reports


What's New in Pylint 0.3.3?
===========================

Release date: 2004-02-17

    * added a parsable text output, used when the --parsable option is
      provided

    * added an emacs mode using this output, available in the distrib's
      elisp directory

    * fixed some typos in messages

    * change include-ids options to yn, and allow it to be in the
      configuration file

    * do not chock on corrupted stats files

    * fixed bug in the format checker which may stop pylint execution

    * provide scripts for unix and windows to wrap the minimal pylint tk
      gui



What's New in Pylint 0.3.2?
===========================

Release date: 2003-12-23

    * html-escape messages in the HTML reporter (bug reported by Juergen
      Hermann)

    * added "TODO" to the list of default note tags

    * added "rexec" to the list of default deprecated modules

    * fixed typos in some messages



What's New in Pylint 0.3.1?
===========================


Release date: 2003-12-05

    * bug fix in format and classes checkers

    * remove print statement from imports checkers

    * provide a simple tk gui, essentially useful for windows users



What's New in Pylint 0.3.0?
===========================


Release date: 2003-11-20

    * new exceptions checker, checking for string exception and empty
      except clauses.

    * imports checker checks for reimport of modules

    * classes checker checks for calls to ancestor's __init__ and abstract
      method not overridden. It doesn't complain anymore for unused import in
      __init__ files, and provides a new option ignore-interface-methods,
      useful when you're using zope Interface implementation in your project

    * base checker checks for black listed builtins call (controlled by the
      bad-functions option) and for use of * and **

    * format checker checks for use of <> and "l" as long int marker

    * major internal API changes

    * use the rewrite of astng, based on compiler.ast

    * added unique id for messages, as suggested by Wolfgang Grafen

    * added unique id for reports

    * can take multiple modules or files as argument

    * new options command line options : --disable-msg, --enable-msg,
      --help-msg, --include-ids, --reports, --disable-report, --cache-size

    * --version shows the version of the python interpreter

    * removed some options which are now replaced by [en|dis]able-msg, or
      disable-report

    * read disable-msg and enable-msg options in source files (should be
      in comments on the top of the file, in the form
      "# pylint: disable-msg=W0402"

    * new message for modules importing themselves instead of the "cyclic
      import" message

    * fix bug with relative and cyclic imports

    * fix bug in imports checker (cycle was not always detected)

    * still fixes in format checker : don't check comment and docstring,
      check first line after an indent

    * black and white list now apply to all identifiers, not only
      variables,  so changed the configuration option from
      (good|bad)-variable-names to (good|bad)-names

    * added string, rexec and Bastion to the default list of deprecated
      modules

    * do not print redefinition warning for function/class/method defined
      in mutually exclusive branches



What's New in Pylint 0.2.1?
===========================


Release date: 2003-10-10

    * added some documentation, fixed some typos

    * set environment variable PYLINT_IMPORT to 1 during pylint execution.

    * check that variables "imported" using the global statement exist

    * indentation problems are now warning instead of errors

    * fix checkers.initialize to try to load all files with a known python
      extension (patch from wrobell)

    * fix a bunch of messages

    * fix sample configuration file

    * fix the bad-construction option

    * fix encoding checker

    * fix format checker


What's New in Pylint 0.2.0?
===========================


Release date: 2003-09-12

    * new source encoding / FIXME checker (pep 263)

    * new --zope option which trigger Zope import. Useful to check Zope
      products code.

    * new --comment option which enable the evaluation note comment
      (disabled by default).

    * a ton of bug fixes

    * easy functional test infrastructure


What's New in Pylint 0.1.2?
===========================


Release date: 2003-06-18

    * bug fix release

    * remove dependency to pyreverse


What's New in Pylint 0.1.1?
===========================


Release date: 2003-06-01

    * much more functionalities !


What's New in Pylint 0.1?
===========================

Release date: 2003-05-19

    * initial release