Features

• Breaking: drops python3.6 support
• Adds support for pattern matching naming rules, same as other variables
• Adds --show-violation-links option to show links to violation docs
• Adds __init_subclass__ in the beginning of accepted methods order as per WPS338 #2411
• Adds WrongEmptyLinesCountViolation to check for too many lines in functions and methods definitions #2486

Bugfixes

• Fixes WPS226 false positives on | use in SomeType | AnotherType type hints syntax
• Now -1 is not reported to be an overused expression
• Allow __aiter__ to be async iterator
• Adds violation method name to error message of YieldMagicMethodViolation
• Fixes direct docker image invocation #2492

Misc

• Adds full violation codes to docs and BaseViolation.full_code #2409
• Fix documentation mismatch between default setting for max-string-usages and enforced rule #2456
• Domain name was changed from wemake-python-stylegui.de to wemake-python-styleguide.rtfd.io

Bugfixes

• Fixes crash on 'Literal["raise"]' annotation #2341
• Fixes WPS471 was not detected on complex assignment targets #2301
• Fixes flake8-bandit and bandit version conflict #2368

Features

• Supports new flake8 version 4.x
• Now InconsistentYieldViolation and InconsistentReturnViolation are raised when yield or return is used with None where plain version should be used #2151
• Dot '.' and comma ',' do not count against string literal overuse limit anymore #2209
• Added RedundantEnumerateViolation #1825
• Adds RaiseFromItselfViolation #2133
• Adds ConsecutiveSlicesViolation #2064
• Adds KwargsUnpackingInClassDefinitionViolation #1754
• DirectMagicAttributeAccessViolation now only flags instances for which a known alternative exists #2268
• Forbids getting collection element of list by unpacking #1824
• Now WPS227 forbids returning tuples that are too long #1731

Bugfixes

• Fixes that InconsistentComprehensionViolation was ignoring misaligned in expressions #2075
• Fixes some common magic methods not being recognized as such #2281

Misc

• Removes all Raises: from docstrings, they were unused
• Improve Docs: Fixed all typos and grammatical errors in CHANGELOG.md
• Updated documentation with the recommended isort config. #1934
• Updates typing_extensions to 4.x

Bugfixes

• Fixes crash on python3.10
• Fixes UselessReturningElseViolation to not report else with break #1958
• Fixes ReassigningVariableToItselfViolation to not report on x = (x,) #1807
• Fixes ReassigningVariableToItselfViolation to extract variables from unary operators #1874
• Fixes that f'{some:,}' was considered too complex #1921
• Fixes that range(len(x)) was not allowed even outside for loops #1883

Misc

• Adds documentation (and tests) for how to run project on Jupyter Notebooks
• Updates mypy to 0.902 and fixes type issues

Bugfixes

• Fixes BitwiseAndBooleanMixupViolation work with PEP 604 union types #1884
• Fixes CognitiveModuleComplexityViolation to not trigger for a single-item modules
• Fixes that ConstantConditionViolation was not reported for a BoolOp
• Functions and methods marked as @overload or @typing.overload do not count in complexity rules

Misc

• Updates GitHub Action's base Python image version to 3.8.8

Bugfixes

• Fixes dataclasses import, it was failing on python3.6
• Fixes InconsistentComprehensionViolation work with async comprehensions
• Fixes nested compehensions support for InconsistentComprehensionViolation
• Fixes multiple if support for InconsistentComprehensionViolation
• Fixes that NestedTernaryViolation was not reported for a comprehension
• Fixes that ConstantConditionViolation was not reported for a comprehension
• Fixes that ConstantConditionViolation was triggering for while x := True:
• Fixes that UselessElseViolation was not reported for for, while, and try keywords
• Fixes false positive InfiniteWhileLoopViolation for try #1857
• Fixes that InfiniteWhileLoopViolation was not triggered on 1 or other truthy nodes

Misc

• Refactors how tokenize tests are executed, now we have an option to compile fixture code to make sure it is syntatically valid

Features

• Adds python3.9 support
• Forbids to use new-style decorators on python3.9
• Changes how we treat own/foreign attributes, since now we only check assigned attribute names for self/cls/mcs, but not any other ones. So, now writting point.x = 1 will not trigger any violations. Previously, it would raise "too short name".
• Forbids using non-trivial expressions as an argument to except
• Forbids using too many variables in a tuple unpacking
• Forbids using float("NaN").
• Forbids assigning to a slice
• Allow __call__ method to be asynchronous
• Allows common strings not to be counted against string constant overuse limit
• Forbids to unpack iterable objects to lists #1259
• Forbids to use single return None
• Add __await__ to the list of priority magic methods
• Forbids to use float zeros (0.0)
• Forbids raise Exception and raise BaseException
• Forbids to use % with zero as the divisor
• WPS531: Forbids testing conditions to just return booleans when it is possible to simply return the condition itself
• Forbids to use unsafe infinite loops
• Forbids to use raw strings r'' when not necessary
• Forbids to use too complex f-strings
• Forbids to use too many raise statements inside a single function
• Forbids to compare with float and complex values
• Forbids single element destruct
• Forbids to ignore some violations (configurable) on a line level
• Forbids single element unpacking
• Forbids to unpack lists with side-effects
• Forbids to use miltiline strings except for assignments and docstrings
• Forbids not returning anything in functions and methods starting with get_
• Forbids to use empty comment
• Forbids using bitwise operation with boolean operation
• Forbids inconsistent structuring of multiline comprehensions
• Forbids to use unpythonic getters and setters such as get_attribute or set_attribute
• Now credits, license, and copyright builtins are free to shadow

Bugfixes

• Fixes fails of annotation complexity on Literal[""]
• Fixes how wrong variable names were checked case sensitive with WPS110
• Fixes false positives DirectMagicAttributeAccessViolation with __mro__, __subclasses__ and __version__
• Make WPS326 work when there is comment between string literals
• Allowed yield statements in call method
• Allow to use ^ with 1
• Fixes false positives in WPS513 and WPS323
• Fixes false positive WPS426 if lambda in loop uses only its arguments
• Fixes false negative WPS421 with pprint.pprint
• Fixes WPS441 triggering when reusing variable names in multiple loops
• Fixes false positive ImplicitEnumerateViolation on range with step #1742
• Allows to use _ to declare several unused variables, like: x, _, _ = coordinates()
• Fixes variable reassignment in class context
• Fixes that *'abc' was not counted as pointless star expression
• Fixes that -some was counted as overused expression
• Fixes several bugs with attribute names

Misc

• Updates lots of dependenices
• Fixed documentation for TooManyPublicAttributesViolation
• Updated isort config
• Introduce helper script to check for missing calls to self.generic_visit(node) in AST visitors
• Updates poetry version to 1.1
• Updates reviewdog version to 0.11.0 and adds action-depup

Bugfixes

• Fixes isort@5 compatibility

This release was focused on adding python3.8 support, removing dependencies that can be removed, and fixing bugs.

There are breaking changes ahead!

We also have this nice migration guide.

One more thing: flake8 still fails on := operator. And there's nothing we can do about it. Please, be patient – this linter does not allow to have := in the source code anyway!

Features

• Breaking: removes flake8-executable, now using WPS452 instead of EXE001..EXE005
• Breaking: removes flake8-print, now using WPS421 instead of T001
• Breaking: removes flake8-builtins, now using WPS125 instead of A001..A005
• Breaking: removes flake8-annotations-complexity, now using WPS234 instead of TAE002
• Breaking: removes flake8-pep3101, now using WPS323 instead of S001, we also use a new logic for this violation: we check string defs for % patterns, and not for % operator
• Breaking: WPS441 is no longer triggered for except blocks, it is now handled by F821 from flake8
• Breaking: removes radon, because cognitive-complexity and mccabe is enough
• Breaking: removes flake8-loggin-format as a direct dependency
• Breaking: removes ImplicitTernaryViolation or WPS332, because it has too many false positives #1099
• Removes flake8-coding, all encoding strings, visitor and tests for old WPS323 which is now reused for modulo formatting checks
• Adds python3.8 support
• Changes styleguide.toml and flake8.toml scripts definition
• Extracts new violation - WPS450 from WPS436 #1118
• Adds domain names options: --allowed-domain-names and --forbidden-domain-names, that are used to create variable names' blacklist #1106
• Forbids to use \r (carriage return) as line breaks in strings #1111
• Forbids to use := operator, it now reuses WPS332 code
• Forbids to use positional only / arguments
• Forbids to have too many names imported from a single from ... import
• Forbids to use continue and break in finally
• Forbids to use __reduce__ and __reduce_ex__ magic methods
• Adds __call__ to list of methods that should be on top #1125
• Allows _ to be now used as a defined variable
• Removes cognitive_complexity dependency, now it is built in into our linter
• Adds baseline information for all complexity violation messages: x > baseline
• Changes how cognitive complexity is calculated
• Adds support for positional arguments in different checks
• Adds UnreadableNameViolation as WPS124 because there are some character combination which is not easy to read
• Adds support for NamedExpr with in compare type violation

Bugfixes

• Fixes how i_control_code behaves with WPS113
• Fixes that cognitive complexity was ignoring ast.Continue, ast.Break, and ast.Raise statements
• Fixes that cognitive complexity was ignoring ast.AsyncFor loops
• Fixes that annotation complexity was not reported for async functions
• Fixes that annotation complexity was not reported for lists
• Fixes that annotation complexity was not reported for * and / args
• Fixes that annotation complexity was not tested for dot notation attributes
• Fixes that annotation complexity fails on string expressions
• Fixes bug when TooManyPublicAttributesViolation was counting duplicate fields
• Fixes negated conditions WPS504 was not reported for if expressions
• Fixes that import dumps was reported as WPS347, now only from ... import dumps is checked
• Fixes that from some import a as std was reported as a vague import with WPS347 despite having a meaningful alias
• Fixes that WPS501 was reported for @contextmanager definition
• Fixes WPS226 to be thrown at nested string type annotations
• Fixes WPS204 reported simplest nodes as overused like [] and call()
• Fixes WPS204 not reporting overused f strings
• Fixes WPS204 reporting overused return type annotations
• Fixes WPS204 reporting self. attribute access
• Fixes WPS331 reporting cases that do require some extra steps before return
• Fixes WPS612 not reporing super() calls without return
• Fixes WPS404 not raising on wrong * and / defaults
• Fixes WPS425 raising on .get, getattr, setattr, and other builtin functions without keyword arguments
• Fixes WPS221 reporting differently on different python versions
• Fixes WPS221 reporting nested variable annotations
• Fixes WPS509 not reporting nested ternary in grandchildren of if
• Fixes WPS509 not reporting nested ternary in ternary
• Fixes WPS426 not reporting nested lambda in comprehensions
• Fixes several violations to reporting for ast.Bytes and ast.FormattedStr where ast.Str was checked
• Fixes WPS601 reporting shadowing for non-self attributes
• Fixes WPS114 not to be so strict
• Fixes WPS122 not raising for for and async for definitions
• Fixes WPS400 raising for # type: ignore[override] comments
• Fixes WPS115 not raising for attributes inside other nodes

Misc

• Changes how tests are executed
• Changes how coverage is calculated, adds coverage-conditional-plugin
• Adds how a violation can be deprecated
• Improves old visitor tests with / argument cases
• Improves old visitor tests with := cases
• Adds local-partial-types to mypy config
• Uses abc stdlib's module to mark abstract base classes #1122
• Adds python3.8 to the CI
• Updates a lot of dependencies

This is the last 0.13.x supporting release, we have to concentrate on python3.8 support and 0.14.0 which will introduce it to the public.

Bugfixes

• Fix false positive ImplicitYieldFromViolation for async functions #1057
• Fixes nested-classes-whitelist option default value for flake8 prior 3.7.8 #1093
• Improve boolean non-keyword arguments validation #1114

Misc

• Updates flake8-pep3101
• Updates flake8-builtins
• Updates flake8-eradicate
• Several small refactoring sessions
• Adds hypothesis-based tests
• Adds flakehell base config
• Fixes flakehell docs
• Fixes MAX_NOQA_COMMENTS and related violation docs
• Fixes OverusedExpressionViolation and TooManyExpressionsViolation docs

Misc

• Updates radon version
• Updates poetry version to 1.0

Bugfixes

• Fixes that Github Action was failing for wrong status code
• Fixes NegatedConditionsViolation false positive on absent else in combination with elif
• Fixes WPS528 false positive on augmented assigns
• Fixes incorrect message for WPS349
• Fixes that reviewdog was not able to create more than 30 comments per PR

Misc

• pylint docs fixed
• Fixes docs about implicit yield violation

Bufixes

• Fixes that _ was marked as invalid by VagueImportViolation
• Fixes that docs for VagueImportViolation were misleading
• Fixes invalid docs for BracketBlankLineViolation #1020
• Add more complex example to ParametersIndentationViolation #1021

Misc

• Now our GitHub Action can be used to leave PR review comments

This is a huge release that was created during the Hactoberfest season. It would have been impossible without the huge help from our awesome contributors. Thanks a lot to everyone!

This release is not focused on any particular area. It features a lot of new rules from different categories.

Features

• Adds cognitive complexity metric, introduced by cognitive_complexity
• Adds docstrings linter darglint
• Updates pep8-naming and flake8-comprehensions
• WPS431 now allow customize whitelist via nested-classes-whitelist setting
• Forbids to have invalid strings in stared expressions like **{'@': 1}
• Forbids to use implicit primitive values in a form of lambda: 0
• Forbids to use approximate math constants
• Forbids to redefine string constants
• Forbids use of vague import names (e.g. from json import loads)
• Makes OveruseOfNoqaCommentViolation configurable via --max-noqa-comments
• Forbid incorrectly swapped variables
• Forbids to use redundant subscripts (e.g., [0:7] or [3:None])
• Allows super() as a valid overused expression
• Forbids to use super() with other methods and properties
• WPS350 enforces using augmented assign pattern
• Forbids unnecessary literals
• WPS525 forbids comparisons where in is compared with single item container
• Forbids wrong annotations in assignment
• Forbids using multiline for and while statements
• WPS113 now can be tweaked with I_CONTROL_CODE setting
• Adds WPS000 that indicates internal errors
• Forbids to use implicit yield from
• Forbids to start lines with .
• Enforces better &, |, >>, <<, ^ operators usage
• Forbids incorrect exception order
• Enforces tuples usage with frozenset constructor
• Changes how WPS444 works, now we use stricter logic for while and assert
• Forbids to use yield from with incorrect types
• Forbids to use consecutive yield expressions
• Enforces to use .items() in loops
• Enforces using .get() over key in dict checks
• Forbids to use and declare float keys in arrays and dictionaries
• Forbids to use a[len(a) - 1] because it is just a[-1]
• Forbids too long call chains like foo(a)(b)(c)(d)

Bugfixes

• Fixes ImplicitElifViolation false positives on a specific edge cases
• Fixes --i-control-code setting for BadMagicModuleFunctionViolation
• Fixes compatibility with flake8 3.8.x
• Fixes that not not True was not detected as WPS330
• Fixes addition of MisrefactoredAssignmentViolation check
• Fixes WrongMagicCommentViolation not catching certain wrong comments
• Fixes BadMagicModuleFunctionViolation false positives on class-level methods
• Fixes InconsistentReturnViolation false positives on nested functions
• Fixes that --i-dont-control-code was not present in command line options
• Fixes BlockVariableVisitor false positives on a properties
• Fixes that // was not recognised as a math operation
• Fixes false positive BlockAndLocalOverlapViolation on annotations without value assign
• Fixes bug when x and not x was not detected as the similar conditions by WPS408
• Fixed that 1.0 and 0.1 were treated as magic numbers

Misc

• Improves Github Action stability
• Replace scripts/tokens.py and scripts/parse.py with external tools
• Improves violation code testing
• Improves testing of .. versionchanged and previous_codes properties
• Reference isort settings requirement for compliance with WSP318 in docstring
• Improves tests: we now ensure that each violation with previous codes also has corresponding versions changed in their documentation

Bugfixes

• We now ignore @overload from BlockAndLocalOverlapViolation
• Now expressions that reuse block variables are not treated as violations, example: my_var = do_some(my_var)

Misc

• Adds Github Action and docs how to use it
• Adds local Github Action that uses itself for testing
• Adds official Docker image and docs about it

Bugfixes

• Fixes bug with nitpick colors and new files API
• Updates flake8-docstrings

Bugfixes

• Fixes that formatting was failing sometimes when colours were not available
• Fixes that 1 / number was not allowed
• Fixes that % operator was allowed for 0 and 1

Features

• Adds reveal_type to the list of forbidden functions
• WPS517 now allows to use non-string keys inside **{}, so this is allowed: Users.objects.get(**{User.USERNAME_FIELD: username})

Bugfixes

• Fixes that {**a, **b} was reported as duplicate hash items

Bugfixes

• Changes radon and pydocstyle versions for better resolution

Misc

• Improves README.md with flakehell and nitpick mentions
• Improves docs all accross the project

In this release we had a little focus on:

0. Primitives and constants and how to use them
1. Strings and numbers and how to write them
2. OOP features
3. Blocks and code structure, including variable scoping and overlaping variables
4. Overused expressions and new complexity metrics

Features

• Breaking: moves ImplicitInConditionViolation from WPS336 to WPS514
• Breaking: now ExplicitStringConcatViolation uses WPS336
• Breaking: moves YieldMagicMethodViolation from WPS435 to WPS611
• Adds xenon as a dependency, it also checks for cyclomatic complexity, but uses more advanced algorithm with better results
• Forbids to have modules with too many imported names configured by --max-imported-names option which is 50 by default
• Forbids to raise StopIteration inside generators
• Forbids to have incorrect method order inside classes
• Forbids to make some magic methods async
• Forbids to use meaningless zeros in float, binary, octal, hex, and expanentional numbers
• Enforces to use 1e10 instead of 1e+10
• Enforces to use big letters for hex numbers: 0xAB instead of 0xab
• Enforces to use r'\n' instead of '\\n'
• Forbids to have unicode escape characters inside binary strings
• Forbids to use else if instead of elif
• Forbids to have too long try bodies, basically try bodies with more than one statement
• Forbids to overlap local and block variables
• Forbids to use block variables after the block definitions
• Changes how WrongSlotsViolation works, now (...) + value is restricted in favor of (..., *value)
• Forbids to have explicit unhashable types in sets and dicts
• Forbids to define useless overwritten methods
• Enforces j prefix over J for complex numbers
• Forbids overused expressions
• Forbids explicit 0 division, multiply, pow, addition, and substraction
• Fordids to pow, multiply, or divide by 1
• Forbids to use expressions like x + -2, or y - -1, or z -= -1
• Forbids to multiply lists like [0] * 2
• Forbids to use variable names like __ and _____
• Forbids to define unused variables explicitly: _unused = 2
• Forbids to shadow outer scope variables with local ones
• Forbids to have too many assert statements in a function
• Forbids to have explicit string contact: 'a' + some_data, use .format()
• Now YieldInsideInitViolation is named YieldMagicMethodViolation and it also checks different magic methods in a class
• Forbids to use assert False and other false-constants
• Forbids to use while False: and other false-constants
• Forbids to use open() outside of with
• Forbids to use type() for compares
• Forbids to have consecutive expressions with too deep access level
• Forbids to have too many public instance attributes
• Forbids to use pointless star operations: print(*[])
• Forbids to use range(len(some)), use enumerate(some) instead
• Forbids to use implicit sum() calls and replace them with loops
• Forbids to compare with the falsy constants like if some == []:

Bugfixes

• Bumps flake8-eradicate version and solves attrs incompatible versions issue
• Bumps flake8-dosctrings veresion and solved pydocstyle issue
• Fixes TryExceptMultipleReturnPathViolation not tracking else and finally returns at the same time
• Fixes how TryExceptMultipleReturnPathViolation works: now handles break and raise statements as well
• Fixes WrongLoopIterTypeViolation not triggering for generator expressions and empty tuples
• Fixes WrongLoopIterTypeViolation not triggering for numbers (including negative), booleans, None
• Fixes WrongLoopIterTypeViolation position
• Fixes WrongLoopIterTypeViolation not triggering for compehensions
• Fixes WrongSlotsViolation not triggering for comprehensions and incorrect __slots__ names and types
• Fixes WrongSlotsViolation not triggering for invalid python identifiers like __slots__ = ('123_slot',)
• Fixes WrongSlotsViolation triggering for subscripts
• Fixes NestedClassViolation and NestedFunctionViolation not reporting when placed deeply inside other nodes
• Fixes when WrongUnpackingViolation was not raised for async for and async with nodes
• Fixes when WrongUnpackingViolation was not raised for comprehensions
• Fixes that x, y, z = x, z, y was not recognized as ReassigningVariableToItselfViolation
• Fixes that {1, True, 1.0} was not recognised as a set with duplicates
• Fixes that {(1, 2), (1, 2)} was not recognised as a set with duplicates
• Fixes that {*(1, 2), *(1, 2)} was not recognised as a set with duplicates
• Fixes that {1: 1, True: 1} was not recognised as a dict with duplicates
• Fixes that complex numbers were always treated like magic, now 1j is allowed
• Fixes that 0.0 was treated as a magic number
• Fixes that it was possible to use _ in module body
• Fixes WrongBaseClassViolation not triggering for nested nodes like class Test(call().length):
• Fixes ComplexDefaultValueViolation not triggering for nested nodes like def func(arg=call().attr)
• Fixes TooShortNameViolation was not triggering for _x and x_
• Fixes that some magic method were allowed to be generators
• Fixes that some magic method were allowed to contain yield from
• Fixes bug when some correct noqa: comments were reported as incorrect
• Fixes bug when some else: return were not reported as incorrect
• Fixes bug when WPS507 sometimes were raising ValueError
• Fixes bug when return None was not recognized as inconsistent

Misc

• Adds styles/ directory with style presets for tools we use and recommend
• Adds bellybutton to the list of other linters
• Documents how to use nitpick to sync the configuration
• Documents how to use flakehell to create baselines for legacy integrations
• Improves tests for binary, octal, hex, and expanetional numbers
• Adds new xenon CI check
• Now handles exceptions in our own code, hope to never see them!
• Now uses coverage checks in deepsource
• Now @alias checks that all aliases are valid
• Changes how presets are defined
• Improves how DirectMagicAttributeAccessViolation is tested
• Refactors a lot of tests to tests ast.Starred
• Refactors a lot of tests to have less tests with the same logical coverage
• We now use import-linter instead of layer-linter
• Adds docs about CI integration
• Now wheels are not universal
• Updates docs about snake_case in Enum fields
• Updates docs about WPS400 and incorrect line number

Bugfixes

• Now using pygments as a direct dependency

We had a really big problem: all violations inside best_practices was messed up together with no clear structure.

We had to fix it before it is too late. So, we broke existing error codes. And now we can promise not to do it ever again.

We also have this nice migration guide for you to rename your violations with a script.

Features

• Breaking: replaces Z error code to WPS code
• Breaking: creates new violation group refactoring.py
• Breaking: creates new violation group oop.py
• Breaking: moving a lot of violations from best_practices to refactoring, oop, and consistency
• Adds new wemake formatter (using it now by default)

Bugfixes

• Fixes error message of OverusedStringViolation for empty strings
• Now does not count string annotations as strings for OverusedStringViolation
• Fixes InconsistentReturnVariableViolation was raised twice

Misc

• Adds migration guide to 0.11
• Improves legacy guide
• Adds --show-source to the default recommended configuration
• Adds better docs about auto-formatters
• Adds autopep8 to CI to make sure that wps is compatible with it
• Ensures that --diff mode works for flake8
• Renames Incorrect to Wrong where possible
• Renames IncorrectlyNestedTernaryViolation to NestedTernaryViolation
• Renames IncorectLoopIterTypeViolation to WrongLoopIterTypeViolation

This release is mostly targeted at writing better compares and conditions. We introduce a lot of new rules related to this topic improving: consistency, complexity, and general feel from your code.

In this release we have ported a lot of existing pylint rules, big cudos to the developers of this wonderful tool.

Features

• Adds flake8-executable as a dependency
• Adds flake8-rst-docstrings as a dependency
• Validates options that are passed with flake8
• Forbids to use module level mutable constants
• Forbids to over-use strings
• Forbids to use breakpoint function
• Limits yield tuple lengths
• Forbids to have too many await statements
• Forbids to subclass lowercase builtins
• Forbids to have useless lambdas
• Forbids to use len(sized) > 0 and if len(sized) style checks
• Forbids to use repeatable conditions: flag or flag
• Forbids to write conditions like not some > 1
• Forbids to use heterogenous compares like x == x > 0
• Forbids to use complex compare with several items (>= 3)
• Forbids to have class variables that are shadowed by instance variables
• Forbids to use ternary expressions inside if conditions
• Forces to use ternary instead of ... and ... or ... expression
• Forces to use c < b < a instead of a > b and b > c
• Forces to use c < b < a instead of a > b > c
• Forbids to use explicit in [] and in (), use sets or variables instead
• Forces to write isinstance(some, (A, B)) instead of isinstance(some, A) or isinstance(some, B)
• Forbids to use isinstance(some (A,))
• Forces to merge a == b or a == c into a in {b, c} and to merge a != b and a != c into a not in {b, c}

Bugfixes

• Fixes incorrect line number for Z331
• Fixes that Z311 was not raising for multiple not in cases
• Fixes a bunch of bugs for rules working with Assign and not AnnAssign
• Fixes that continue was not triggering UselessReturningElseViolation

Misc

• Renames logics/ to logic/ since it is grammatically correct
• Renames Redundant to Useless
• Renames Comparison to Compare
• Renames WrongConditionalViolation to ConstantConditionViolation
• Renames ComplexDefaultValuesViolation to ComplexDefaultValueViolation
• Refactors UselessOperatorsVisitor
• Adds compat/ package, getting ready for python3.8
• Adds Makefile
• A lot of minor dependency updates

Bugfixes

• Fixes issue with pydocstyle>=4 by glueing its version to pydocstyle<4

This is mostly a supporting release with several new features and lots of bug fixes.

Features

• Forbids to use magic module methods __getattr__ and __dir__
• Forbids to use multiline conditions
• Forbids local variables that are only used in return statements

Bugfixes

• Fixes module names for modules like io.py
• Fixes false positive Z310 for numbers like 0xE
• Fixes false positive for compare ordering with await
• Fixes problem with missing _allowed_left_nodes
• Fixes problem false positive for Z121 when using _ for unused var names
• Fixes false positive for negative number in default values
• Fixes error text for ComplexDefaultValuesViolation
• Fixes problem with false positive for Z459 when a default value is an Ellipsis

Misc

• Adds py.typed file in case someone will import our code, now it will have types
• Adds several missing @final decorators
• Enforces typing support
• Refactors how typing_extensions package is used
• Adds docs about black
• Adds big "Star" button
• Multiple dependencies update
• Better exclude rule for flake8 check
• Removed warnings from pytest

Bugfixes

• Fixes how wps_context is calculated, so super() calls are now working

Features

• Updates flake8 to 3.7+
• Adds flake8-annotations-complexity as a dependency, forbids complex annotations
• Forbids to use redundant +, ~, not, and - operators before numbers
• Forbids to use complex default values
• Forbids to use anything rather than names in for loop vars definitions
• Forbids to use anything rather than names in with block vars definitions
• Forbids to use anything rather than names in comprehension vars definitions
• Forbids to use direct magic attributes access
• Forbids to use negated conditions
• Forbids to use too many # pragma: no cover comments
• Forbids to use nested try blocks

Bugfixes

• Fixes problems with empty lines after magic comments, see #492
• Fixes error message for del keyword: it is now just 'del' not 'delete'

Misc

• Removes flake8-per-file-ignores plugin, since flake8 now handles it
• Removes flake8-type-annotations plugin, since flake8 now handles it
• Improves docs for WrongKeywordViolation
• Improves docs for EmptyLineAfterCodingViolation
• Improves docs for ProtectedAttributeViolation
• Adds docs about .pyi files

Bugfixes

• Allows Generic[SomeType] to be a valid superclass
• Forces to use flake8 version 3.6 instead of 3.7

Misc

• Improves docs about using # type: some comment in for loops

Features

• Now raising a violation for every bool non-keyword argument and showing better error message
• Changes how max-arguments are counted. Now self, cls, and mcs count as real arguments
• Forbids to use yield inside comprehensions
• Forbids to have single line triple-quoted string assignments
• Forbids to have same items in set literals
• Forbids to subclass BaseException
• Forbids to use simplifiable if expressions and nodes
• Forbids to have incorrect nodes in class body
• Forbids to have methods without any arguments
• Forbids to have incorrect base classes nodes
• Enforces consistent __slots__ syntax
• Forbids to use names with trailing _ without a reason
• Forbids to use super() with arguments or outside of methods
• Forbids to have too many except cases
• Enforces to have an empty line after coding comment
• Forbids to use too many # noqa comments
• Forbids to use variables declared as unused
• Forbids to use redundant else blocks
• Forbids to use inconsistent return and yield statements
• Forbids to use multiple return path in try/expect/finally
• Forbids to use implicit string concatenation
• Forbids to have useless continue nodes inside the loops
• Forbids to have useless nodes
• Forbids to have useless raise statements
• Adds params and parameters to black-listed names

Bugfixes

• Fixes a lot of rules that were ignoring Bytes node as constant type
• Fixes location of the BooleanPositionalArgumentViolation
• Fixes argument count issue with async functions
• Fixes WrongConditionalVisitor not detecting tuple as constants
• Fixes WrongConditionalVisitor not detecting negative numbers as constants
• Fixes some magic number that were not detected based on their location
• Fixes error when regular functions named as blacklisted magic methods were forbidden, now we check for methods only
• Fixes error when strings like U'some' was not triggering unicode violation
• Fixes error when string like U'some' was not triggering modifier violation

Misc

• Adds safety and other dependency checks to the CI process
• Improves tests: now tokenize works differently inside tests
• Improves tests: now testing more brackets cases aka "magic coverage bug"
• Improves docs: adds new badge about our code style
• Refactoring: trying to use astor where possible to simplify the codebase
• Refactoring: introduces some new transformations
• Refactoring: now we do not have any magical text casts for violations
• Improves tests: changes how flake8 is executed, now it is twice as fast
• Improves docs: now linting conf.py with flake8
• Improves tests: now we check that ignored violation are raised with noqa
• Improves docs: we have added a special graph to show our architecure
• Improves docs: we now have a clean page for checker without extra junk
• Improves docs: we now have a tutorial for creating new rules
• Refactoring: moves presets package to the root
• Improves tests: we now lint our layered architecure with layer-lint

Bugfixes

• Fixes an issue-450 with dicts with just values and no keys