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What's New in Pylint 2.10

Release:2.10
Date: TBA

Summary -- Release highlights

New checkers

  • Added unspecified-encoding: Emitted when open() is called without specifying an encoding

    Closes #3826

  • Added use-list-literal: Emitted when list() is called with no arguments instead of using []

    Closes #4365

  • Added use-dict-literal: Emitted when dict() is called with no arguments instead of using {}

    Closes #4365

  • Added optional extension consider-ternary-expression: Emitted whenever a variable is assigned in both branches of an if/else block.

    Closes # 4366

  • Added optional extension while-used: Emitted whenever a while loop is used.

    Closes # 4367

  • Added forgotten-debug-statement: Emitted when breakpoint, pdb.set_trace or sys.breakpointhook calls are found

    Closes #3692

  • Added use-sequence-for-iteration: Emitted when iterating over an in-place defined set.

  • Added consider-using-f-string: Emitted when .format() or '%' is being used to format a string.

    Closes #3592

Extensions

  • CodeStyleChecker
    • Limit consider-using-tuple to be emitted only for in-place defined lists.
    • Emit consider-using-tuple even if list contains a starred expression.

Other Changes

  • pyreverse now permit to produce colored generated diagram by using the colorized option.

  • Pyreverse - add output in PlantUML format

  • consider-using-with is no longer triggered if a context manager is returned from a function.

  • pylint does not crash with a traceback anymore when a file is problematic. It creates a template text file for opening an issue on the bug tracker instead. The linting can go on for other non problematic files instead of being impossible.

  • Pyreverse - Show class has-a relationships inferred from type-hints

  • Performance of the Similarity checker has been improved.

  • Added time.clock to deprecated functions/methods for python 3.3

  • Added ignored-parents option to the design checker to ignore specific classes from the too-many-ancestors check (R0901).

  • Don't emit no-member error if guarded behind if statement.

    Ref #1162 Closes #1990 Closes #4168

  • Fix false positives for superfluous-parens with walrus operator, ternary operator and inside list comprehension.

    Closes #2818 Closes #3249 Closes #3608 Closes #4346

  • Refactor of --list-msgs & --list-msgs-enabled: both options now show whether messages are emittable with the current interpreter.

    Closes #4778

  • Fix false negative for used-before-assignment when the variable is assigned in an exception handler, but used outside of the handler.

    Closes #626

  • Added disable-next option: allows using # pylint: disable-next=msgid to disable a message for the following line

    Closes #1682

  • Added format-string-without-interpolation checker: Emitted when formatting is applied to a string without any variables to be replaced

    Closes #4042

  • Added redundant-u-string-prefix checker: Emitted when the u prefix is added to a string

    Closes #4102

  • Fixed cell-var-from-loop checker: handle cell variables in comprehensions within functions, and function default argument expressions. Also handle basic variable shadowing.

    Closes #2846 Closes #3107

  • Fixed bug with cell-var-from-loop checker: it no longer has false negatives when both unused-variable and used-before-assignment are disabled.

  • Class methods' signatures are now ignored the same way as functions' with similarities "ignore-signatures" option enabled

    Closes #4653