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What's New in Pylint 2.14

Release

2.14

Date

TBA

Summary -- Release highlights

New checkers

  • Added new checker typevar-name-mismatch: TypeVar must be assigned to a variable with the same name as its name argument.

    Closes #5224

  • invalid-enum-extension: Used when a class tries to extend an inherited Enum class.

    Closes #5501

  • Added new checker typevar-double-variance: The "covariant" and "contravariant" keyword arguments cannot both be set to "True" in a TypeVar.

    Closes #5895

  • Add new check unnecessary-dunder-call for unnecessary dunder method calls.

    Closes #5936

  • potential-index-error: Emitted when the index of a list or tuple exceeds its length. This checker is currently quite conservative to avoid false positives. We welcome suggestions for improvements.

    Closes #578

  • Added new checker unnecessary-list-index-lookup for indexing into a list while iterating over enumerate().

    Closes #4525

  • Added new message called duplicate-value which identifies duplicate values inside sets.

    Closes #5880

  • Added the super-without-brackets checker, raised when a super call is missing its brackets.

    Closes #4008

Removed checkers

  • The no-init (W0232) warning has been removed. It's ok to not have an __init__ in a class.

    Closes #2409

Extensions

  • DocStringStyleChecker

    • Re-enable checker bad-docstring-quotes for Python <= 3.7.

      Closes #6087

Other Changes

  • Pylint now requires Python 3.7.2 or newer to run.

    Closes #4301

  • Update invalid-slots-object message to show bad object rather than its inferred value.

    Closes #6101

  • Fix a failure to respect inline disables for fixme occurring on the last line of a module when pylint is launched with --enable=fixme.

  • Removed the broken generate-man option.

    Closes #5283 Closes #1887

  • Fixed failure to enable deprecated-module after a disable=all by making ImportsChecker solely responsible for emitting deprecated-module instead of sharing responsibility with StdlibChecker. (This could have led to double messages.)

  • The config attribute of BaseChecker has been deprecated. You can use checker.linter.config to access the global configuration object instead of a checker-specific object.

    Ref #5392

  • The level attribute of BaseChecker has been deprecated: everything is now displayed in --help, all the time.

    Ref #5392

  • The set_option method of BaseChecker has been deprecated. You can use checker.linter.set_option to set an option on the global configuration object instead of a checker-specific object.

    Ref #5392

  • The options_providers attribute of ArgumentsManager has been deprecated.

    Ref #5392

  • The config attribute of PyLinter is now of the argparse.Namespace type instead of optparse.Values.

    Ref #5392

  • UnsupportedAction has been deprecated.

    Ref #5392

  • OptionsManagerMixIn has been deprecated.

    Ref #5392

  • OptionParser has been deprecated.

    Ref #5392

  • Option has been deprecated.

    Ref #5392

  • OptionsProviderMixIn has been deprecated.

    Ref #5392

  • ConfigurationMixIn has been deprecated.

  • The option_groups attribute of PyLinter has been deprecated.

    Ref #5392

  • get_global_config has been deprecated. You can now access all global options from checker.linter.config.

    Ref #5392

  • OptionsManagerMixIn has been replaced with ArgumentsManager. ArgumentsManager is considered private API and most methods that were public on OptionsManagerMixIn have now been deprecated and will be removed in a future release.

    Ref #5392

  • OptionsProviderMixIn has been replaced with ArgumentsProvider. ArgumentsProvider is considered private API and most methods that were public on OptionsProviderMixIn have now been deprecated and will be removed in a future release.

    Ref #5392

  • Added the generate-toml-config option.

    Ref #5462

  • bad-option-value will be emitted whenever a configuration value or command line invocation includes an unknown message.

    Closes #4324

  • Added the unrecognized-option message. Raised if we encounter any unrecognized options.

    Closes #5259

  • Fix false negative for bad-string-format-type if the value to be formatted is passed in as a variable holding a constant.
  • The concept of checker priority has been removed.

  • The cache-max-size-none checker has been renamed to method-cache-max-size-none.

    Closes #5670

  • The method-cache-max-size-none checker will now also check functools.cache.

    Closes #5670

  • BaseChecker classes now require the linter argument to be passed.
  • The set_config_directly decorator has been removed.

  • The ignore-mixin-members option has been deprecated. You should now use the new ignored-checks-for-mixins option.

    Closes #5205

  • Fix false positive for unsubscriptable-object in Python 3.8 and below for statements guarded by if TYPE_CHECKING.

    Closes #3979

  • Fix false negative for no-member when attempting to assign an instance attribute to itself without any prior assignment.

    Closes #1555