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Change Log

Unreleased

Black

  • reindent docstrings when reindenting code around it (#1053)

  • show colored diffs (#1266)

  • move to 'py3' tagged wheels (#1388)

  • remove deprecated --py36 option (#1236)

  • add --force-exclude argument (#1032)

Vim plugin

  • prefer virtualenv packages over global packages (#1383)

19.10b0

  • added support for PEP 572 assignment expressions (#711)

  • added support for PEP 570 positional-only arguments (#943)

  • added support for async generators (#593)

  • added support for pre-splitting collections by putting an explicit trailing comma inside (#826)

  • added black -c as a way to format code passed from the command line (#761)

  • --safe now works with Python 2 code (#840)

  • fixed grammar selection for Python 2-specific code (#765)

  • fixed feature detection for trailing commas in function definitions and call sites (#763)

  • # fmt: off/# fmt: on comment pairs placed multiple times within the same block of code now behave correctly (#1005)

  • Black no longer crashes on Windows machines with more than 61 cores (#838)

  • Black no longer crashes on standalone comments prepended with a backslash (#767)

  • Black no longer crashes on from ... import blocks with comments (#829)

  • Black no longer crashes on Python 3.7 on some platform configurations (#494)

  • Black no longer fails on comments in from-imports (#671)

  • Black no longer fails when the file starts with a backslash (#922)

  • Black no longer merges regular comments with type comments (#1027)

  • Black no longer splits long lines that contain type comments (#997)

  • removed unnecessary parentheses around yield expressions (#834)

  • added parentheses around long tuples in unpacking assignments (#832)

  • added parentheses around complex powers when they are prefixed by a unary operator (#646)

  • fixed bug that led Black format some code with a line length target of 1 (#762)

  • Black no longer introduces quotes in f-string subexpressions on string boundaries (#863)

  • if Black puts parenthesis around a single expression, it moves comments to the wrapped expression instead of after the brackets (#872)

  • blackd now returns the version of Black in the response headers (#1013)

  • blackd can now output the diff of formats on source code when the X-Diff header is provided (#969)

19.3b0

  • new option --target-version to control which Python versions Black-formatted code should target (#618)

  • deprecated --py36 (use --target-version=py36 instead) (#724)

  • Black no longer normalizes numeric literals to include _ separators (#696)

  • long del statements are now split into multiple lines (#698)

  • type comments are no longer mangled in function signatures

  • improved performance of formatting deeply nested data structures (#509)

  • Black now properly formats multiple files in parallel on Windows (#632)

  • Black now creates cache files atomically which allows it to be used in parallel pipelines (like xargs -P8) (#673)

  • Black now correctly indents comments in files that were previously formatted with tabs (#262)

  • blackd now supports CORS (#622)

18.9b0

  • numeric literals are now formatted by Black (#452, #461, #464, #469):

    • numeric literals are normalized to include _ separators on Python 3.6+ code

    • added --skip-numeric-underscore-normalization to disable the above behavior and leave numeric underscores as they were in the input

    • code with _ in numeric literals is recognized as Python 3.6+

    • most letters in numeric literals are lowercased (e.g., in 1e10, 0x01)

    • hexadecimal digits are always uppercased (e.g. 0xBADC0DE)

  • added blackd, see its documentation for more info (#349)

  • adjacent string literals are now correctly split into multiple lines (#463)

  • trailing comma is now added to single imports that don't fit on a line (#250)

  • cache is now populated when --check is successful for a file which speeds up consecutive checks of properly formatted unmodified files (#448)

  • whitespace at the beginning of the file is now removed (#399)

  • fixed mangling pweave and Spyder IDE special comments (#532)

  • fixed unstable formatting when unpacking big tuples (#267)

  • fixed parsing of __future__ imports with renames (#389)

  • fixed scope of # fmt: off when directly preceding yield and other nodes (#385)

  • fixed formatting of lambda expressions with default arguments (#468)

  • fixed async for statements: Black no longer breaks them into separate lines (#372)

  • note: the Vim plugin stopped registering ,= as a default chord as it turned out to be a bad idea (#415)

18.6b4

  • hotfix: don't freeze when multiple comments directly precede # fmt: off (#371)

18.6b3

  • typing stub files (.pyi) now have blank lines added after constants (#340)

  • # fmt: off and # fmt: on are now much more dependable:

    • they now work also within bracket pairs (#329)

    • they now correctly work across function/class boundaries (#335)

    • they now work when an indentation block starts with empty lines or misaligned comments (#334)

  • made Click not fail on invalid environments; note that Click is right but the likelihood we'll need to access non-ASCII file paths when dealing with Python source code is low (#277)

  • fixed improper formatting of f-strings with quotes inside interpolated expressions (#322)

  • fixed unnecessary slowdown when long list literals where found in a file

  • fixed unnecessary slowdown on AST nodes with very many siblings

  • fixed cannibalizing backslashes during string normalization

  • fixed a crash due to symbolic links pointing outside of the project directory (#338)

18.6b2

  • added --config (#65)

  • added -h equivalent to --help (#316)

  • fixed improper unmodified file caching when -S was used

  • fixed extra space in string unpacking (#305)

  • fixed formatting of empty triple quoted strings (#313)

  • fixed unnecessary slowdown in comment placement calculation on lines without comments

18.6b1

  • hotfix: don't output human-facing information on stdout (#299)

  • hotfix: don't output cake emoji on non-zero return code (#300)

18.6b0

  • added --include and --exclude (#270)

  • added --skip-string-normalization (#118)

  • added --verbose (#283)

  • the header output in --diff now actually conforms to the unified diff spec

  • fixed long trivial assignments being wrapped in unnecessary parentheses (#273)

  • fixed unnecessary parentheses when a line contained multiline strings (#232)

  • fixed stdin handling not working correctly if an old version of Click was used (#276)

  • Black now preserves line endings when formatting a file in place (#258)

18.5b1

  • added --pyi (#249)

  • added --py36 (#249)

  • Python grammar pickle caches are stored with the formatting caches, making Black work in environments where site-packages is not user-writable (#192)

  • Black now enforces a PEP 257 empty line after a class-level docstring (and/or fields) and the first method

  • fixed invalid code produced when standalone comments were present in a trailer that was omitted from line splitting on a large expression (#237)

  • fixed optional parentheses being removed within # fmt: off sections (#224)

  • fixed invalid code produced when stars in very long imports were incorrectly wrapped in optional parentheses (#234)

  • fixed unstable formatting when inline comments were moved around in a trailer that was omitted from line splitting on a large expression (#238)

  • fixed extra empty line between a class declaration and the first method if no class docstring or fields are present (#219)

  • fixed extra empty line between a function signature and an inner function or inner class (#196)

18.5b0

  • call chains are now formatted according to the fluent interfaces style (#67)

  • data structure literals (tuples, lists, dictionaries, and sets) are now also always exploded like imports when they don't fit in a single line (#152)

  • slices are now formatted according to PEP 8 (#178)

  • parentheses are now also managed automatically on the right-hand side of assignments and return statements (#140)

  • math operators now use their respective priorities for delimiting multiline expressions (#148)

  • optional parentheses are now omitted on expressions that start or end with a bracket and only contain a single operator (#177)

  • empty parentheses in a class definition are now removed (#145, #180)

  • string prefixes are now standardized to lowercase and u is removed on Python 3.6+ only code and Python 2.7+ code with the unicode_literals future import (#188, #198, #199)

  • typing stub files (.pyi) are now formatted in a style that is consistent with PEP 484 (#207, #210)

  • progress when reformatting many files is now reported incrementally

  • fixed trailers (content with brackets) being unnecessarily exploded into their own lines after a dedented closing bracket (#119)

  • fixed an invalid trailing comma sometimes left in imports (#185)

  • fixed non-deterministic formatting when multiple pairs of removable parentheses were used (#183)

  • fixed multiline strings being unnecessarily wrapped in optional parentheses in long assignments (#215)

  • fixed not splitting long from-imports with only a single name

  • fixed Python 3.6+ file discovery by also looking at function calls with unpacking. This fixed non-deterministic formatting if trailing commas where used both in function signatures with stars and function calls with stars but the former would be reformatted to a single line.

  • fixed crash on dealing with optional parentheses (#193)

  • fixed "is", "is not", "in", and "not in" not considered operators for splitting purposes

  • fixed crash when dead symlinks where encountered

18.4a4

  • don't populate the cache on --check (#175)

18.4a3

  • added a "cache"; files already reformatted that haven't changed on disk won't be reformatted again (#109)

  • --check and --diff are no longer mutually exclusive (#149)

  • generalized star expression handling, including double stars; this fixes multiplication making expressions "unsafe" for trailing commas (#132)

  • Black no longer enforces putting empty lines behind control flow statements (#90)

  • Black now splits imports like "Mode 3 + trailing comma" of isort (#127)

  • fixed comment indentation when a standalone comment closes a block (#16, #32)

  • fixed standalone comments receiving extra empty lines if immediately preceding a class, def, or decorator (#56, #154)

  • fixed --diff not showing entire path (#130)

  • fixed parsing of complex expressions after star and double stars in function calls (#2)

  • fixed invalid splitting on comma in lambda arguments (#133)

  • fixed missing splits of ternary expressions (#141)

18.4a2

  • fixed parsing of unaligned standalone comments (#99, #112)

  • fixed placement of dictionary unpacking inside dictionary literals (#111)

  • Vim plugin now works on Windows, too

  • fixed unstable formatting when encountering unnecessarily escaped quotes in a string (#120)

18.4a1

  • added --quiet (#78)

  • added automatic parentheses management (#4)

  • added pre-commit integration (#103, #104)

  • fixed reporting on --check with multiple files (#101, #102)

  • fixed removing backslash escapes from raw strings (#100, #105)

18.4a0

  • added --diff (#87)

  • add line breaks before all delimiters, except in cases like commas, to better comply with PEP 8 (#73)

  • standardize string literals to use double quotes (almost) everywhere (#75)

  • fixed handling of standalone comments within nested bracketed expressions; Black will no longer produce super long lines or put all standalone comments at the end of the expression (#22)

  • fixed 18.3a4 regression: don't crash and burn on empty lines with trailing whitespace (#80)

  • fixed 18.3a4 regression: # yapf: disable usage as trailing comment would cause Black to not emit the rest of the file (#95)

  • when CTRL+C is pressed while formatting many files, Black no longer freaks out with a flurry of asyncio-related exceptions

  • only allow up to two empty lines on module level and only single empty lines within functions (#74)

18.3a4

  • # fmt: off and # fmt: on are implemented (#5)

  • automatic detection of deprecated Python 2 forms of print statements and exec statements in the formatted file (#49)

  • use proper spaces for complex expressions in default values of typed function arguments (#60)

  • only return exit code 1 when --check is used (#50)

  • don't remove single trailing commas from square bracket indexing (#59)

  • don't omit whitespace if the previous factor leaf wasn't a math operator (#55)

  • omit extra space in kwarg unpacking if it's the first argument (#46)

  • omit extra space in Sphinx auto-attribute comments (#68)

18.3a3

  • don't remove single empty lines outside of bracketed expressions (#19)

  • added ability to pipe formatting from stdin to stdin (#25)

  • restored ability to format code with legacy usage of async as a name (#20, #42)

  • even better handling of numpy-style array indexing (#33, again)

18.3a2

  • changed positioning of binary operators to occur at beginning of lines instead of at the end, following a recent change to PEP 8 (#21)

  • ignore empty bracket pairs while splitting. This avoids very weirdly looking formattings (#34, #35)

  • remove a trailing comma if there is a single argument to a call

  • if top level functions were separated by a comment, don't put four empty lines after the upper function

  • fixed unstable formatting of newlines with imports

  • fixed unintentional folding of post scriptum standalone comments into last statement if it was a simple statement (#18, #28)

  • fixed missing space in numpy-style array indexing (#33)

  • fixed spurious space after star-based unary expressions (#31)

18.3a1

  • added --check

  • only put trailing commas in function signatures and calls if it's safe to do so. If the file is Python 3.6+ it's always safe, otherwise only safe if there are no *args or **kwargs used in the signature or call. (#8)

  • fixed invalid spacing of dots in relative imports (#6, #13)

  • fixed invalid splitting after comma on unpacked variables in for-loops (#23)

  • fixed spurious space in parenthesized set expressions (#7)

  • fixed spurious space after opening parentheses and in default arguments (#14, #17)

  • fixed spurious space after unary operators when the operand was a complex expression (#15)

18.3a0

  • first published version, Happy 🍰 Day 2018!

  • alpha quality

  • date-versioned (see: https://calver.org/)