:Release: 2.7 :Date: 2021-02-21 Summary -- Release highlights ============================= * Python 3.6+ is now required. * No more duplicate messages when using multiple jobs. * Handling of the new typing provided by mypy 0.8 * Reduced the number of false positives in general * Reduced the occurrence of genuinely large recursion that went above system limit (See #3836, for a fix for pandas) New checkers ============ * Add ``nan-comparison`` check for comparison of NaN values * Add support to ``ignored-argument-names`` in DocstringParameterChecker and adds ``useless-param-doc`` and ``useless-type-doc`` messages. * Add ``empty-comment`` check for empty comments. * Add ``simplifiable-condition`` check for extraneous constants in conditionals using and/or. * Add ``condition-evals-to-constant`` check for conditionals using and/or that evaluate to a constant. * Add ``consider-using-generator`` check for the use of list comprehension inside ``any`` or ``all`` function. Other Changes ============= * Fix false positive for ``builtin-not-iterating`` when ``zip`` or ``map`` receives iterable * Fix linter multiprocessing pool shutdown which triggered warnings when ran in parallels with other pytest plugins. * Enums are now required to be named in UPPER_CASE by ``invalid-name``. * Fix bug that lead to duplicate messages when using ``--jobs 2`` or more. * Adds option ``check-protected-access-in-special-methods`` in the ClassChecker to activate/deactivate ``protected-access`` message emission for single underscore prefixed attribute in special methods. * ``inconsistent-return-statements`` message is now emitted if one of ``try/except`` statement is not returning explicitly while the other do. * Fix false positive message ``useless-super-delegation`` when default keyword argument is a dictionary. * Fix vulnerable regular expressions in ``pyreverse``. The ambiguities of vulnerable regular expressions are removed, making the repaired regular expressions safer and faster matching. * ``len-as-conditions`` is now triggered only for classes that are inheriting directly from list, dict, or set and not implementing the ``__bool__`` function, or from generators like range or list/dict/set comprehension. This should reduce the false positive for other classes, like pandas's DataFrame or numpy's Array. * Fixes duplicate code detection for --jobs=2+ * New option ``allowed-redefined-builtins`` defines variable names allowed to shadow builtins. * Improved protected access checks to allow access inside class methods