All patches and comments are welcome. Please squash your changes to logical
commits before using git-format-patch and git-send-email to
patches@git.madduck.net.
If you'd read over the Git project's submission guidelines and adhered to them,
I'd be especially grateful.
7 <!-- Include any especially major or disruptive changes here -->
11 <!-- Changes that affect Black's stable style -->
15 <!-- Changes that affect Black's preview style -->
17 - Remove unnecessary parentheses from `with` statements (#2926)
21 <!-- Changes to blackd -->
25 <!-- Changes to how Black can be configured -->
29 <!-- Major changes to documentation and policies. Small docs changes
30 don't need a changelog entry. -->
34 <!-- For example, Docker, GitHub Actions, pre-commit, editors -->
38 <!-- Changes to Black's terminal output and error messages -->
42 <!-- Changes to how Black is packaged, such as dependency requirements -->
44 - Use `tomli` instead of `tomllib` on Python 3.11 builds where `tomllib` is not
49 <!-- Changes to the parser or to version autodetection -->
53 <!-- Changes that improve Black's performance. -->
59 - Code cell separators `#%%` are now standardised to `# %%` (#2919)
60 - Remove unnecessary parentheses from `except` statements (#2939)
61 - Remove unnecessary parentheses from tuple unpacking in `for` loops (#2945)
62 - Avoid magic-trailing-comma in single-element subscripts (#2942)
66 - Do not format `__pypackages__` directories by default (#2836)
67 - Add support for specifying stable version with `--required-version` (#2832).
68 - Avoid crashing when the user has no homedir (#2814)
69 - Avoid crashing when md5 is not available (#2905)
70 - Fix handling of directory junctions on Windows (#2904)
74 - Update pylint config documentation (#2931)
78 - Move test to disable plugin in Vim/Neovim, which speeds up loading (#2896)
82 - In verbose, mode, log when _Black_ is using user-level config (#2861)
86 - Fix Black to work with Click 8.1.0 (#2966)
87 - On Python 3.11 and newer, use the standard library's `tomllib` instead of `tomli`
89 - `black-primer`, the deprecated internal devtool, has been removed and copied to a
90 [separate repository](https://github.com/cooperlees/black-primer) (#2924)
94 - Black can now parse starred expressions in the target of `for` and `async for`
95 statements, e.g `for item in *items_1, *items_2: pass` (#2879).
99 At long last, _Black_ is no longer a beta product! This is the first non-beta release
100 and the first release covered by our new
101 [stability policy](https://black.readthedocs.io/en/stable/the_black_code_style/index.html#stability-policy).
105 - **Remove Python 2 support** (#2740)
106 - Introduce the `--preview` flag (#2752)
110 - Deprecate `--experimental-string-processing` and move the functionality under
112 - For stubs, one blank line between class attributes and methods is now kept if there's
113 at least one pre-existing blank line (#2736)
114 - Black now normalizes string prefix order (#2297)
115 - Remove spaces around power operators if both operands are simple (#2726)
116 - Work around bug that causes unstable formatting in some cases in the presence of the
117 magic trailing comma (#2807)
118 - Use parentheses for attribute access on decimal float and int literals (#2799)
119 - Don't add whitespace for attribute access on hexadecimal, binary, octal, and complex
121 - Treat blank lines in stubs the same inside top-level `if` statements (#2820)
122 - Fix unstable formatting with semicolons and arithmetic expressions (#2817)
123 - Fix unstable formatting around magic trailing comma (#2572)
127 - Fix mapping cases that contain as-expressions, like `case {"key": 1 | 2 as password}`
129 - Fix cases that contain multiple top-level as-expressions, like `case 1 as a, 2 as b`
131 - Fix call patterns that contain as-expressions with keyword arguments, like
132 `case Foo(bar=baz as quux)` (#2749)
133 - Tuple unpacking on `return` and `yield` constructs now implies 3.8+ (#2700)
134 - Unparenthesized tuples on annotated assignments (e.g
135 `values: Tuple[int, ...] = 1, 2, 3`) now implies 3.8+ (#2708)
136 - Fix handling of standalone `match()` or `case()` when there is a trailing newline or a
137 comment inside of the parentheses. (#2760)
138 - `from __future__ import annotations` statement now implies Python 3.7+ (#2690)
142 - Speed-up the new backtracking parser about 4X in general (enabled when
143 `--target-version` is set to 3.10 and higher). (#2728)
144 - _Black_ is now compiled with [mypyc](https://github.com/mypyc/mypyc) for an overall 2x
145 speed-up. 64-bit Windows, MacOS, and Linux (not including musl) are supported. (#1009,
150 - Do not accept bare carriage return line endings in pyproject.toml (#2408)
151 - Add configuration option (`python-cell-magics`) to format cells with custom magics in
152 Jupyter Notebooks (#2744)
153 - Allow setting custom cache directory on all platforms with environment variable
154 `BLACK_CACHE_DIR` (#2739).
155 - Enable Python 3.10+ by default, without any extra need to specify
156 `--target-version=py310`. (#2758)
157 - Make passing `SRC` or `--code` mandatory and mutually exclusive (#2804)
161 - Improve error message for invalid regular expression (#2678)
162 - Improve error message when parsing fails during AST safety check by embedding the
163 underlying SyntaxError (#2693)
164 - No longer color diff headers white as it's unreadable in light themed terminals
166 - Text coloring added in the final statistics (#2712)
167 - Verbose mode also now describes how a project root was discovered and which paths will
168 be formatted. (#2526)
172 - All upper version bounds on dependencies have been removed (#2718)
173 - `typing-extensions` is no longer a required dependency in Python 3.10+ (#2772)
174 - Set `click` lower bound to `8.0.0` (#2791)
178 - Update GitHub action to support containerized runs (#2748)
182 - Change protocol in pip installation instructions to `https://` (#2761)
183 - Change HTML theme to Furo primarily for its responsive design and mobile support
185 - Deprecate the `black-primer` tool (#2809)
186 - Document Python support policy (#2819)
192 - Fix determination of f-string expression spans (#2654)
193 - Fix bad formatting of error messages about EOF in multi-line statements (#2343)
194 - Functions and classes in blocks now have more consistent surrounding spacing (#2472)
196 #### Jupyter Notebook support
198 - Cell magics are now only processed if they are known Python cell magics. Earlier, all
199 cell magics were tokenized, leading to possible indentation errors e.g. with
200 `%%writefile`. (#2630)
201 - Fix assignment to environment variables in Jupyter Notebooks (#2642)
203 #### Python 3.10 support
205 - Point users to using `--target-version py310` if we detect 3.10-only syntax (#2668)
206 - Fix `match` statements with open sequence subjects, like `match a, b:` or
207 `match a, *b:` (#2639) (#2659)
208 - Fix `match`/`case` statements that contain `match`/`case` soft keywords multiple
209 times, like `match re.match()` (#2661)
210 - Fix `case` statements with an inline body (#2665)
211 - Fix styling of starred expressions inside `match` subject (#2667)
212 - Fix parser error location on invalid syntax in a `match` statement (#2649)
213 - Fix Python 3.10 support on platforms without ProcessPoolExecutor (#2631)
214 - Improve parsing performance on code that uses `match` under `--target-version py310`
219 - Remove dependency on `regex` (#2644) (#2663)
225 - Bumped regex version minimum to 2021.4.4 to fix Pattern class usage (#2621)
231 - Warn about Python 2 deprecation in more cases by improving Python 2 only syntax
233 - Add experimental PyPy support (#2559)
234 - Add partial support for the match statement. As it's experimental, it's only enabled
235 when `--target-version py310` is explicitly specified (#2586)
236 - Add support for parenthesized with (#2586)
237 - Declare support for Python 3.10 for running Black (#2562)
241 - Fixed vim plugin with Python 3.10 by removing deprecated distutils import (#2610)
242 - The vim plugin now parses `skip_magic_trailing_comma` from pyproject.toml (#2613)
248 - Document stability policy, that will apply for non-beta releases (#2529)
249 - Add new `--workers` parameter (#2514)
250 - Fixed feature detection for positional-only arguments in lambdas (#2532)
251 - Bumped typed-ast version minimum to 1.4.3 for 3.10 compatibility (#2519)
252 - Fixed a Python 3.10 compatibility issue where the loop argument was still being passed
253 even though it has been removed (#2580)
254 - Deprecate Python 2 formatting support (#2523)
258 - Remove dependency on aiohttp-cors (#2500)
259 - Bump required aiohttp version to 3.7.4 (#2509)
263 - Add primer support for --projects (#2555)
264 - Print primer summary after individual failures (#2570)
268 - Allow to pass `target_version` in the vim plugin (#1319)
269 - Install build tools in docker file and use multi-stage build to keep the image size
276 - Fix missing modules in self-contained binaries (#2466)
277 - Fix missing toml extra used during installation (#2475)
283 - Add support for formatting Jupyter Notebook files (#2357)
284 - Move from `appdirs` dependency to `platformdirs` (#2375)
285 - Present a more user-friendly error if .gitignore is invalid (#2414)
286 - The failsafe for accidentally added backslashes in f-string expressions has been
287 hardened to handle more edge cases during quote normalization (#2437)
288 - Avoid changing a function return type annotation's type to a tuple by adding a
289 trailing comma (#2384)
290 - Parsing support has been added for unparenthesized walruses in set literals, set
291 comprehensions, and indices (#2447).
292 - Pin `setuptools-scm` build-time dependency version (#2457)
293 - Exclude typing-extensions version 3.10.0.1 due to it being broken on Python 3.10
298 - Replace sys.exit(-1) with raise ImportError as it plays more nicely with tools that
299 scan installed packages (#2440)
303 - The provided pre-commit hooks no longer specify `language_version` to avoid overriding
304 `default_language_version` (#2430)
310 - Configuration files using TOML features higher than spec v0.5.0 are now supported
312 - Add primer support and test for code piped into black via STDIN (#2315)
313 - Fix internal error when `FORCE_OPTIONAL_PARENTHESES` feature is enabled (#2332)
314 - Accept empty stdin (#2346)
315 - Provide a more useful error when parsing fails during AST safety checks (#2304)
319 - Add new `latest_release` tag automation to follow latest black release on docker
324 - The vim plugin now searches upwards from the directory containing the current buffer
325 instead of the current working directory for pyproject.toml. (#1871)
326 - The vim plugin now reads the correct string normalization option in pyproject.toml
328 - The vim plugin no longer crashes Black when there's boolean values in pyproject.toml
335 - Fix failure caused by `fmt: skip` and indentation (#2281)
336 - Account for += assignment when deciding whether to split string (#2312)
337 - Correct max string length calculation when there are string operators (#2292)
338 - Fixed option usage when using the `--code` flag (#2259)
339 - Do not call `uvloop.install()` when _Black_ is used as a library (#2303)
340 - Added `--required-version` option to require a specific version to be running (#2300)
341 - Fix incorrect custom breakpoint indices when string group contains fake f-strings
343 - Fix regression where `R` prefixes would be lowercased for docstrings (#2285)
344 - Fix handling of named escapes (`\N{...}`) when `--experimental-string-processing` is
349 - The official Black action now supports choosing what version to use, and supports the
350 major 3 OSes. (#1940)
356 - A space is no longer inserted into empty docstrings (#2249)
357 - Fix handling of .gitignore files containing non-ASCII characters on Windows (#2229)
358 - Respect `.gitignore` files in all levels, not only `root/.gitignore` file (apply
359 `.gitignore` rules like `git` does) (#2225)
360 - Restored compatibility with Click 8.0 on Python 3.6 when LANG=C used (#2227)
361 - Add extra uvloop install + import support if in python env (#2258)
362 - Fix --experimental-string-processing crash when matching parens are not found (#2283)
363 - Make sure to split lines that start with a string operator (#2286)
364 - Fix regular expression that black uses to identify f-expressions (#2287)
368 - Add a lower bound for the `aiohttp-cors` dependency. Only 0.4.0 or higher is
373 - Release self-contained x86_64 MacOS binaries as part of the GitHub release pipeline
375 - Always build binaries with the latest available Python (#2260)
379 - Add discussion of magic comments to FAQ page (#2272)
380 - `--experimental-string-processing` will be enabled by default in the future (#2273)
381 - Fix typos discovered by codespell (#2228)
382 - Fix Vim plugin installation instructions. (#2235)
383 - Add new Frequently Asked Questions page (#2247)
384 - Fix encoding + symlink issues preventing proper build on Windows (#2262)
390 - Refactor `src/black/__init__.py` into many files (#2206)
394 - Replaced all remaining references to the
395 [`master`](https://github.com/psf/black/tree/main) branch with the
396 [`main`](https://github.com/psf/black/tree/main) branch. Some additional changes in
397 the source code were also made. (#2210)
398 - Sigificantly reorganized the documentation to make much more sense. Check them out by
399 heading over to [the stable docs on RTD](https://black.readthedocs.io/en/stable/).
406 - Set `--pyi` mode if `--stdin-filename` ends in `.pyi` (#2169)
407 - Stop detecting target version as Python 3.9+ with pre-PEP-614 decorators that are
408 being called but with no arguments (#2182)
412 - Add `--no-diff` to black-primer to suppress formatting changes (#2187)
418 - Fix crash if the user configuration directory is inaccessible. (#2158)
421 [circumstances](https://github.com/psf/black/blob/master/docs/the_black_code_style.md#pragmatism)
422 in which _Black_ may change the AST (#2159)
424 - Allow `.gitignore` rules to be overridden by specifying `exclude` in `pyproject.toml`
425 or on the command line. (#2170)
429 - Install `primer.json` (used by `black-primer` by default) with black. (#2154)
435 - Fix crash on docstrings ending with "\\ ". (#2142)
437 - Fix crash when atypical whitespace is cleaned out of dostrings (#2120)
439 - Reflect the `--skip-magic-trailing-comma` and `--experimental-string-processing` flags
440 in the name of the cache file. Without this fix, changes in these flags would not take
441 effect if the cache had already been populated. (#2131)
443 - Don't remove necessary parentheses from assignment expression containing assert /
444 return statements. (#2143)
448 - Bump pathspec to >= 0.8.1 to solve invalid .gitignore exclusion handling
454 - Fixed a rare but annoying formatting instability created by the combination of
455 optional trailing commas inserted by `Black` and optional parentheses looking at
456 pre-existing "magic" trailing commas. This fixes issue #1629 and all of its many many
459 - `Black` now processes one-line docstrings by stripping leading and trailing spaces,
460 and adding a padding space when needed to break up """". (#1740)
462 - `Black` now cleans up leading non-breaking spaces in comments (#2092)
464 - `Black` now respects `--skip-string-normalization` when normalizing multiline
465 docstring quotes (#1637)
467 - `Black` no longer removes all empty lines between non-function code and decorators
468 when formatting typing stubs. Now `Black` enforces a single empty line. (#1646)
470 - `Black` no longer adds an incorrect space after a parenthesized assignment expression
471 in if/while statements (#1655)
473 - Added `--skip-magic-trailing-comma` / `-C` to avoid using trailing commas as a reason
474 to split lines (#1824)
476 - fixed a crash when PWD=/ on POSIX (#1631)
478 - fixed "I/O operation on closed file" when using --diff (#1664)
480 - Prevent coloured diff output being interleaved with multiple files (#1673)
482 - Added support for PEP 614 relaxed decorator syntax on python 3.9 (#1711)
484 - Added parsing support for unparenthesized tuples and yield expressions in annotated
487 - added `--extend-exclude` argument (PR #2005)
489 - speed up caching by avoiding pathlib (#1950)
491 - `--diff` correctly indicates when a file doesn't end in a newline (#1662)
493 - Added `--stdin-filename` argument to allow stdin to respect `--force-exclude` rules
496 - Lines ending with `fmt: skip` will now be not formatted (#1800)
498 - PR #2053: Black no longer relies on typed-ast for Python 3.8 and higher
500 - PR #2053: Python 2 support is now optional, install with
501 `python3 -m pip install black[python2]` to maintain support.
503 - Exclude `venv` directory by default (#1683)
505 - Fixed "Black produced code that is not equivalent to the source" when formatting
506 Python 2 docstrings (#2037)
510 - Self-contained native _Black_ binaries are now provided for releases via GitHub
517 - explicitly depend on Click 7.1.2 or newer as `Black` no longer works with versions
524 - re-implemented support for explicit trailing commas: now it works consistently within
525 any bracket pair, including nested structures (#1288 and duplicates)
527 - `Black` now reindents docstrings when reindenting code around it (#1053)
529 - `Black` now shows colored diffs (#1266)
531 - `Black` is now packaged using 'py3' tagged wheels (#1388)
533 - `Black` now supports Python 3.8 code, e.g. star expressions in return statements
536 - `Black` no longer normalizes capital R-string prefixes as those have a
537 community-accepted meaning (#1244)
539 - `Black` now uses exit code 2 when specified configuration file doesn't exit (#1361)
541 - `Black` now works on AWS Lambda (#1141)
543 - added `--force-exclude` argument (#1032)
545 - removed deprecated `--py36` option (#1236)
547 - fixed `--diff` output when EOF is encountered (#526)
549 - fixed `# fmt: off` handling around decorators (#560)
551 - fixed unstable formatting with some `# type: ignore` comments (#1113)
553 - fixed invalid removal on organizing brackets followed by indexing (#1575)
555 - introduced `black-primer`, a CI tool that allows us to run regression tests against
556 existing open source users of Black (#1402)
558 - introduced property-based fuzzing to our test suite based on Hypothesis and
559 Hypothersmith (#1566)
561 - implemented experimental and disabled by default long string rewrapping (#1132),
562 hidden under a `--experimental-string-processing` flag while it's being worked on;
563 this is an undocumented and unsupported feature, you lose Internet points for
564 depending on it (#1609)
568 - prefer virtualenv packages over global packages (#1383)
572 - added support for PEP 572 assignment expressions (#711)
574 - added support for PEP 570 positional-only arguments (#943)
576 - added support for async generators (#593)
578 - added support for pre-splitting collections by putting an explicit trailing comma
581 - added `black -c` as a way to format code passed from the command line (#761)
583 - --safe now works with Python 2 code (#840)
585 - fixed grammar selection for Python 2-specific code (#765)
587 - fixed feature detection for trailing commas in function definitions and call sites
590 - `# fmt: off`/`# fmt: on` comment pairs placed multiple times within the same block of
591 code now behave correctly (#1005)
593 - _Black_ no longer crashes on Windows machines with more than 61 cores (#838)
595 - _Black_ no longer crashes on standalone comments prepended with a backslash (#767)
597 - _Black_ no longer crashes on `from` ... `import` blocks with comments (#829)
599 - _Black_ no longer crashes on Python 3.7 on some platform configurations (#494)
601 - _Black_ no longer fails on comments in from-imports (#671)
603 - _Black_ no longer fails when the file starts with a backslash (#922)
605 - _Black_ no longer merges regular comments with type comments (#1027)
607 - _Black_ no longer splits long lines that contain type comments (#997)
609 - removed unnecessary parentheses around `yield` expressions (#834)
611 - added parentheses around long tuples in unpacking assignments (#832)
613 - added parentheses around complex powers when they are prefixed by a unary operator
616 - fixed bug that led _Black_ format some code with a line length target of 1 (#762)
618 - _Black_ no longer introduces quotes in f-string subexpressions on string boundaries
621 - if _Black_ puts parenthesis around a single expression, it moves comments to the
622 wrapped expression instead of after the brackets (#872)
624 - `blackd` now returns the version of _Black_ in the response headers (#1013)
626 - `blackd` can now output the diff of formats on source code when the `X-Diff` header is
631 - new option `--target-version` to control which Python versions _Black_-formatted code
634 - deprecated `--py36` (use `--target-version=py36` instead) (#724)
636 - _Black_ no longer normalizes numeric literals to include `_` separators (#696)
638 - long `del` statements are now split into multiple lines (#698)
640 - type comments are no longer mangled in function signatures
642 - improved performance of formatting deeply nested data structures (#509)
644 - _Black_ now properly formats multiple files in parallel on Windows (#632)
646 - _Black_ now creates cache files atomically which allows it to be used in parallel
647 pipelines (like `xargs -P8`) (#673)
649 - _Black_ now correctly indents comments in files that were previously formatted with
652 - `blackd` now supports CORS (#622)
656 - numeric literals are now formatted by _Black_ (#452, #461, #464, #469):
658 - numeric literals are normalized to include `_` separators on Python 3.6+ code
660 - added `--skip-numeric-underscore-normalization` to disable the above behavior and
661 leave numeric underscores as they were in the input
663 - code with `_` in numeric literals is recognized as Python 3.6+
665 - most letters in numeric literals are lowercased (e.g., in `1e10`, `0x01`)
667 - hexadecimal digits are always uppercased (e.g. `0xBADC0DE`)
669 - added `blackd`, see
670 [its documentation](https://github.com/psf/black/blob/18.9b0/README.md#blackd) for
673 - adjacent string literals are now correctly split into multiple lines (#463)
675 - trailing comma is now added to single imports that don't fit on a line (#250)
677 - cache is now populated when `--check` is successful for a file which speeds up
678 consecutive checks of properly formatted unmodified files (#448)
680 - whitespace at the beginning of the file is now removed (#399)
682 - fixed mangling [pweave](http://mpastell.com/pweave/) and
683 [Spyder IDE](https://www.spyder-ide.org/) special comments (#532)
685 - fixed unstable formatting when unpacking big tuples (#267)
687 - fixed parsing of `__future__` imports with renames (#389)
689 - fixed scope of `# fmt: off` when directly preceding `yield` and other nodes (#385)
691 - fixed formatting of lambda expressions with default arguments (#468)
693 - fixed `async for` statements: _Black_ no longer breaks them into separate lines (#372)
695 - note: the Vim plugin stopped registering `,=` as a default chord as it turned out to
700 - hotfix: don't freeze when multiple comments directly precede `# fmt: off` (#371)
704 - typing stub files (`.pyi`) now have blank lines added after constants (#340)
706 - `# fmt: off` and `# fmt: on` are now much more dependable:
708 - they now work also within bracket pairs (#329)
710 - they now correctly work across function/class boundaries (#335)
712 - they now work when an indentation block starts with empty lines or misaligned
715 - made Click not fail on invalid environments; note that Click is right but the
716 likelihood we'll need to access non-ASCII file paths when dealing with Python source
719 - fixed improper formatting of f-strings with quotes inside interpolated expressions
722 - fixed unnecessary slowdown when long list literals where found in a file
724 - fixed unnecessary slowdown on AST nodes with very many siblings
726 - fixed cannibalizing backslashes during string normalization
728 - fixed a crash due to symbolic links pointing outside of the project directory (#338)
732 - added `--config` (#65)
734 - added `-h` equivalent to `--help` (#316)
736 - fixed improper unmodified file caching when `-S` was used
738 - fixed extra space in string unpacking (#305)
740 - fixed formatting of empty triple quoted strings (#313)
742 - fixed unnecessary slowdown in comment placement calculation on lines without comments
746 - hotfix: don't output human-facing information on stdout (#299)
748 - hotfix: don't output cake emoji on non-zero return code (#300)
752 - added `--include` and `--exclude` (#270)
754 - added `--skip-string-normalization` (#118)
756 - added `--verbose` (#283)
758 - the header output in `--diff` now actually conforms to the unified diff spec
760 - fixed long trivial assignments being wrapped in unnecessary parentheses (#273)
762 - fixed unnecessary parentheses when a line contained multiline strings (#232)
764 - fixed stdin handling not working correctly if an old version of Click was used (#276)
766 - _Black_ now preserves line endings when formatting a file in place (#258)
770 - added `--pyi` (#249)
772 - added `--py36` (#249)
774 - Python grammar pickle caches are stored with the formatting caches, making _Black_
775 work in environments where site-packages is not user-writable (#192)
777 - _Black_ now enforces a PEP 257 empty line after a class-level docstring (and/or
778 fields) and the first method
780 - fixed invalid code produced when standalone comments were present in a trailer that
781 was omitted from line splitting on a large expression (#237)
783 - fixed optional parentheses being removed within `# fmt: off` sections (#224)
785 - fixed invalid code produced when stars in very long imports were incorrectly wrapped
786 in optional parentheses (#234)
788 - fixed unstable formatting when inline comments were moved around in a trailer that was
789 omitted from line splitting on a large expression (#238)
791 - fixed extra empty line between a class declaration and the first method if no class
792 docstring or fields are present (#219)
794 - fixed extra empty line between a function signature and an inner function or inner
799 - call chains are now formatted according to the
800 [fluent interfaces](https://en.wikipedia.org/wiki/Fluent_interface) style (#67)
802 - data structure literals (tuples, lists, dictionaries, and sets) are now also always
803 exploded like imports when they don't fit in a single line (#152)
805 - slices are now formatted according to PEP 8 (#178)
807 - parentheses are now also managed automatically on the right-hand side of assignments
808 and return statements (#140)
810 - math operators now use their respective priorities for delimiting multiline
813 - optional parentheses are now omitted on expressions that start or end with a bracket
814 and only contain a single operator (#177)
816 - empty parentheses in a class definition are now removed (#145, #180)
818 - string prefixes are now standardized to lowercase and `u` is removed on Python 3.6+
819 only code and Python 2.7+ code with the `unicode_literals` future import (#188, #198,
822 - typing stub files (`.pyi`) are now formatted in a style that is consistent with PEP
825 - progress when reformatting many files is now reported incrementally
827 - fixed trailers (content with brackets) being unnecessarily exploded into their own
828 lines after a dedented closing bracket (#119)
830 - fixed an invalid trailing comma sometimes left in imports (#185)
832 - fixed non-deterministic formatting when multiple pairs of removable parentheses were
835 - fixed multiline strings being unnecessarily wrapped in optional parentheses in long
838 - fixed not splitting long from-imports with only a single name
840 - fixed Python 3.6+ file discovery by also looking at function calls with unpacking.
841 This fixed non-deterministic formatting if trailing commas where used both in function
842 signatures with stars and function calls with stars but the former would be
843 reformatted to a single line.
845 - fixed crash on dealing with optional parentheses (#193)
847 - fixed "is", "is not", "in", and "not in" not considered operators for splitting
850 - fixed crash when dead symlinks where encountered
854 - don't populate the cache on `--check` (#175)
858 - added a "cache"; files already reformatted that haven't changed on disk won't be
859 reformatted again (#109)
861 - `--check` and `--diff` are no longer mutually exclusive (#149)
863 - generalized star expression handling, including double stars; this fixes
864 multiplication making expressions "unsafe" for trailing commas (#132)
866 - _Black_ no longer enforces putting empty lines behind control flow statements (#90)
868 - _Black_ now splits imports like "Mode 3 + trailing comma" of isort (#127)
870 - fixed comment indentation when a standalone comment closes a block (#16, #32)
872 - fixed standalone comments receiving extra empty lines if immediately preceding a
873 class, def, or decorator (#56, #154)
875 - fixed `--diff` not showing entire path (#130)
877 - fixed parsing of complex expressions after star and double stars in function calls
880 - fixed invalid splitting on comma in lambda arguments (#133)
882 - fixed missing splits of ternary expressions (#141)
886 - fixed parsing of unaligned standalone comments (#99, #112)
888 - fixed placement of dictionary unpacking inside dictionary literals (#111)
890 - Vim plugin now works on Windows, too
892 - fixed unstable formatting when encountering unnecessarily escaped quotes in a string
897 - added `--quiet` (#78)
899 - added automatic parentheses management (#4)
901 - added [pre-commit](https://pre-commit.com) integration (#103, #104)
903 - fixed reporting on `--check` with multiple files (#101, #102)
905 - fixed removing backslash escapes from raw strings (#100, #105)
909 - added `--diff` (#87)
911 - add line breaks before all delimiters, except in cases like commas, to better comply
914 - standardize string literals to use double quotes (almost) everywhere (#75)
916 - fixed handling of standalone comments within nested bracketed expressions; _Black_
917 will no longer produce super long lines or put all standalone comments at the end of
920 - fixed 18.3a4 regression: don't crash and burn on empty lines with trailing whitespace
923 - fixed 18.3a4 regression: `# yapf: disable` usage as trailing comment would cause
924 _Black_ to not emit the rest of the file (#95)
926 - when CTRL+C is pressed while formatting many files, _Black_ no longer freaks out with
927 a flurry of asyncio-related exceptions
929 - only allow up to two empty lines on module level and only single empty lines within
934 - `# fmt: off` and `# fmt: on` are implemented (#5)
936 - automatic detection of deprecated Python 2 forms of print statements and exec
937 statements in the formatted file (#49)
939 - use proper spaces for complex expressions in default values of typed function
942 - only return exit code 1 when --check is used (#50)
944 - don't remove single trailing commas from square bracket indexing (#59)
946 - don't omit whitespace if the previous factor leaf wasn't a math operator (#55)
948 - omit extra space in kwarg unpacking if it's the first argument (#46)
950 - omit extra space in
951 [Sphinx auto-attribute comments](http://www.sphinx-doc.org/en/stable/ext/autodoc.html#directive-autoattribute)
956 - don't remove single empty lines outside of bracketed expressions (#19)
958 - added ability to pipe formatting from stdin to stdin (#25)
960 - restored ability to format code with legacy usage of `async` as a name (#20, #42)
962 - even better handling of numpy-style array indexing (#33, again)
966 - changed positioning of binary operators to occur at beginning of lines instead of at
968 [a recent change to PEP 8](https://github.com/python/peps/commit/c59c4376ad233a62ca4b3a6060c81368bd21e85b)
971 - ignore empty bracket pairs while splitting. This avoids very weirdly looking
972 formattings (#34, #35)
974 - remove a trailing comma if there is a single argument to a call
976 - if top level functions were separated by a comment, don't put four empty lines after
979 - fixed unstable formatting of newlines with imports
981 - fixed unintentional folding of post scriptum standalone comments into last statement
982 if it was a simple statement (#18, #28)
984 - fixed missing space in numpy-style array indexing (#33)
986 - fixed spurious space after star-based unary expressions (#31)
992 - only put trailing commas in function signatures and calls if it's safe to do so. If
993 the file is Python 3.6+ it's always safe, otherwise only safe if there are no `*args`
994 or `**kwargs` used in the signature or call. (#8)
996 - fixed invalid spacing of dots in relative imports (#6, #13)
998 - fixed invalid splitting after comma on unpacked variables in for-loops (#23)
1000 - fixed spurious space in parenthesized set expressions (#7)
1002 - fixed spurious space after opening parentheses and in default arguments (#14, #17)
1004 - fixed spurious space after unary operators when the operand was a complex expression
1009 - first published version, Happy 🍰 Day 2018!
1013 - date-versioned (see: <https://calver.org/>)