---
_Contents:_ **[Installation and usage](#installation-and-usage)** |
-**[Code style](#the-black-code-style)** | **[Pragmatism](#pragmatism)**
+**[Code style](#the-black-code-style)** | **[Pragmatism](#pragmatism)** |
**[pyproject.toml](#pyprojecttoml)** | **[Editor integration](#editor-integration)** |
-**[blackd](#blackd)** | **[Version control integration](#version-control-integration)**
-| **[Ignoring unmodified files](#ignoring-unmodified-files)** | **[Used by](#used-by)**
-| **[Testimonials](#testimonials)** | **[Show your style](#show-your-style)** |
+**[blackd](#blackd)** | **[black-primer](#black-primer)** |
+**[Version control integration](#version-control-integration)** |
+**[Ignoring unmodified files](#ignoring-unmodified-files)** | **[Used by](#used-by)** |
+**[Testimonials](#testimonials)** | **[Show your style](#show-your-style)** |
**[Contributing](#contributing-to-black)** | **[Change Log](#change-log)** |
**[Authors](#authors)**
To get started right away with sensible defaults:
-```
+```sh
black {source_file_or_directory}
```
_Black_ doesn't provide many options. You can list them by running `black --help`:
```text
-black [OPTIONS] [SRC]...
+Usage: black [OPTIONS] [SRC]...
+
+ The uncompromising code formatter.
Options:
-c, --code TEXT Format the code passed in as a string.
-l, --line-length INTEGER How many characters per line to allow.
[default: 88]
+
-t, --target-version [py27|py33|py34|py35|py36|py37|py38]
Python versions that should be supported by
Black's output. [default: per-file auto-
detection]
- --py36 Allow using Python 3.6-only syntax on all
- input files. This will put trailing commas
- in function signatures and calls also after
- *args and **kwargs. Deprecated; use
- --target-version instead. [default: per-file
- auto-detection]
+
--pyi Format all input files like typing stubs
regardless of file extension (useful when
piping source on standard input).
+
-S, --skip-string-normalization
Don't normalize string quotes or prefixes.
--check Don't write the files back, just return the
status. Return code 0 means nothing would
change. Return code 1 means some files
- would be reformatted. Return code 123 means
+ would be reformatted. Return code 123 means
there was an internal error.
+
--diff Don't write the files back, just output a
diff for each file on stdout.
+
+ --color / --no-color Show colored diff. Only applies when
+ `--diff` is given.
+
--fast / --safe If --fast given, skip temporary sanity
checks. [default: --safe]
+
--include TEXT A regular expression that matches files and
directories that should be included on
recursive searches. An empty value means
on all platforms (Windows, too). Exclusions
are calculated first, inclusions later.
[default: \.pyi?$]
+
--exclude TEXT A regular expression that matches files and
directories that should be excluded on
recursive searches. An empty value means no
directories on all platforms (Windows, too).
Exclusions are calculated first, inclusions
later. [default: /(\.eggs|\.git|\.hg|\.mypy
- _cache|\.nox|\.tox|\.venv|_build|buck-
+ _cache|\.nox|\.tox|\.venv|\.svn|_build|buck-
out|build|dist)/]
+
+ --force-exclude TEXT Like --exclude, but files and directories
+ matching this regex will be excluded even
+ when they are passed explicitly as arguments
+
-q, --quiet Don't emit non-error messages to stderr.
- Errors are still emitted, silence those with
+ Errors are still emitted; silence those with
2>/dev/null.
+
-v, --verbose Also emit messages to stderr about files
that were not changed or were ignored due to
--exclude=.
+
--version Show the version and exit.
- --config PATH Read configuration from PATH.
+ --config FILE Read configuration from PATH.
-h, --help Show this message and exit.
```
- it only outputs messages to users on standard error;
- exits with code 0 unless an internal error occurred (or `--check` was used).
+### Using _Black_ with other tools
+
+While _Black_ enforces formatting that conforms to PEP 8, other tools may raise warnings
+about _Black_'s changes or will overwrite _Black_'s changes. A good example of this is
+[isort](https://pypi.org/p/isort). Since _Black_ is barely configurable, these tools
+should be configured to neither warn about nor overwrite _Black_'s changes.
+
+Actual details on _Black_ compatible configurations for various tools can be found in
+[compatible_configs](https://github.com/psf/black/blob/master/docs/compatible_configs.md).
+
+### Migrating your code style without ruining git blame
+
+A long-standing argument against moving to automated code formatters like _Black_ is
+that the migration will clutter up the output of `git blame`. This was a valid argument,
+but since Git version 2.23, Git natively supports
+[ignoring revisions in blame](https://git-scm.com/docs/git-blame#Documentation/git-blame.txt---ignore-revltrevgt)
+with the `--ignore-rev` option. You can also pass a file listing the revisions to ignore
+using the `--ignore-revs-file` option. The changes made by the revision will be ignored
+when assigning blame. Lines modified by an ignored revision will be blamed on the
+previous revision that modified those lines.
+
+So when migrating your project's code style to _Black_, reformat everything and commit
+the changes (preferably in one massive commit). Then put the full 40 characters commit
+identifier(s) into a file.
+
+```
+# Migrate code style to Black
+5b4ab991dede475d393e9d69ec388fd6bd949699
+```
+
+Afterwards, you can pass that file to `git blame` and see clean and meaningful blame
+information.
+
+```console
+$ git blame important.py --ignore-revs-file .git-blame-ignore-revs
+7a1ae265 (John Smith 2019-04-15 15:55:13 -0400 1) def very_important_function(text, file):
+abdfd8b0 (Alice Doe 2019-09-23 11:39:32 -0400 2) text = text.lstrip()
+7a1ae265 (John Smith 2019-04-15 15:55:13 -0400 3) with open(file, "r+") as f:
+7a1ae265 (John Smith 2019-04-15 15:55:13 -0400 4) f.write(formatted)
+```
+
+You can even configure `git` to automatically ignore revisions listed in a file on every
+call to `git blame`.
+
+```console
+$ git config blame.ignoreRevsFile .git-blame-ignore-revs
+```
+
+**The one caveat is that GitHub and GitLab do not yet support ignoring revisions using
+their native UI of blame.** So blame information will be cluttered with a reformatting
+commit on those platforms. (If you'd like this feature, there's an open issue for
+[GitLab](https://gitlab.com/gitlab-org/gitlab/-/issues/31423) and please let GitHub
+know!)
+
### NOTE: This is a beta product
_Black_ is already [successfully used](#used-by) by many projects, small and big. It
...
```
+_Black_ prefers parentheses over backslashes, and will remove backslashes if found.
+
+```py3
+# in:
+
+if some_short_rule1 \
+ and some_short_rule2:
+ ...
+
+# out:
+
+if some_short_rule1 and some_short_rule2:
+ ...
+
+
+# in:
+
+if some_long_rule1 \
+ and some_long_rule2:
+ ...
+
+# out:
+
+if (
+ some_long_rule1
+ and some_long_rule2
+):
+ ...
+
+```
+
+Backslashes and multiline strings are one of the two places in the Python grammar that
+break significant indentation. You never need backslashes, they are used to force the
+grammar to accept breaks that would otherwise be parse errors. That makes them confusing
+to look at and brittle to modify. This is why _Black_ always gets rid of them.
+
+If you're reaching for backslashes, that's a clear signal that you can do better if you
+slightly refactor your code. I hope some of the examples above show you that there are
+many ways in which you can do it.
+
+However there is one exception: `with` statements using multiple context managers.
+Python's grammar does not allow organizing parentheses around the series of context
+managers.
+
+We don't want formatting like:
+
+```py3
+with make_context_manager1() as cm1, make_context_manager2() as cm2, make_context_manager3() as cm3, make_context_manager4() as cm4:
+ ... # nothing to split on - line too long
+```
+
+So _Black_ will now format it like this:
+
+```py3
+with \
+ make_context_manager(1) as cm1, \
+ make_context_manager(2) as cm2, \
+ make_context_manager(3) as cm3, \
+ make_context_manager(4) as cm4 \
+:
+ ... # backslashes and an ugly stranded colon
+```
+
You might have noticed that closing brackets are always dedented and that a trailing
comma is always added. Such formatting produces smaller diffs; when you add or remove an
element, it's always just one line. Also, having the closing bracket dedented provides a
[recommends](https://www.python.org/dev/peps/pep-0008/#whitespace-in-expressions-and-statements)
to treat `:` in slices as a binary operator with the lowest priority, and to leave an
equal amount of space on either side, except if a parameter is omitted (e.g.
-`ham[1 + 1 :]`). It also states that for extended slices, both `:` operators have to
-have the same amount of spacing, except if a parameter is omitted (`ham[1 + 1 ::]`).
-_Black_ enforces these rules consistently.
+`ham[1 + 1 :]`). It recommends no spaces around `:` operators for "simple expressions"
+(`ham[lower:upper]`), and extra space for "complex expressions"
+(`ham[lower : upper + offset]`). _Black_ treats anything more than variable names as
+"complex" (`ham[lower : upper + 1]`). It also states that for extended slices, both `:`
+operators have to have the same amount of spacing, except if a parameter is omitted
+(`ham[1 + 1 ::]`). _Black_ enforces these rules consistently.
This behaviour may raise `E203 whitespace before ':'` warnings in style guide
enforcement tools like Flake8. Since `E203` is not PEP 8 compliant, you should tell
_Black_ does make some exceptions to rules it otherwise holds. This section documents
what those exceptions are and why this is the case.
-### The magic trailling comma
+### The magic trailing comma
_Black_ in general does not take existing formatting into account.
### Emacs
-Use [proofit404/blacken](https://github.com/proofit404/blacken) or
-[Elpy](https://github.com/jorgenschaefer/elpy).
+Options include the following:
+
+- [purcell/reformatter.el](https://github.com/purcell/reformatter.el)
+- [proofit404/blacken](https://github.com/proofit404/blacken)
+- [Elpy](https://github.com/jorgenschaefer/elpy).
### PyCharm/IntelliJ IDEA
%LocalAppData%\Programs\Python\Python36-32\Scripts\black.exe # possible location
```
+Note that if you are using a virtual environment detected by PyCharm, this is an
+unneeded step. In this case the path to `black` is `$PyInterpreterDirectory$/black`.
+
3. Open External tools in PyCharm/IntelliJ IDEA
On macOS:
6. Optionally, run _Black_ on every file save:
1. Make sure you have the
- [File Watcher](https://plugins.jetbrains.com/plugin/7177-file-watchers) plugin
+ [File Watchers](https://plugins.jetbrains.com/plugin/7177-file-watchers) plugin
installed.
2. Go to `Preferences or Settings -> Tools -> File Watchers` and click `+` to add a
new watcher:
- Output paths to refresh: `$FilePath$`
- Working directory: `$ProjectFileDir$`
- - Uncheck "Auto-save edited files to trigger the watcher"
+ - Uncheck "Auto-save edited files to trigger the watcher" in Advanced Options
### Wing IDE
To install with [vim-plug](https://github.com/junegunn/vim-plug):
```
-Plug 'psf/black'
+Plug 'psf/black', { 'branch': 'stable' }
```
or with [Vundle](https://github.com/VundleVim/Vundle.vim):
Plugin 'psf/black'
```
+and execute the following in a terminal:
+
+```console
+$ cd ~/.vim/bundle/black
+$ git checkout origin/stable -b stable
+```
+
or you can copy the plugin from
-[plugin/black.vim](https://github.com/psf/black/tree/master/plugin/black.vim).
+[plugin/black.vim](https://github.com/psf/black/blob/stable/plugin/black.vim).
```
mkdir -p ~/.vim/pack/python/start/black/plugin
use: `./configure --enable-python3interp=yes`. There's many guides online how to do
this.
+**I get an import error when using _Black_ from a virtual environment**: If you get an
+error message like this:
+
+```text
+Traceback (most recent call last):
+ File "<string>", line 63, in <module>
+ File "/home/gui/.vim/black/lib/python3.7/site-packages/black.py", line 45, in <module>
+ from typed_ast import ast3, ast27
+ File "/home/gui/.vim/black/lib/python3.7/site-packages/typed_ast/ast3.py", line 40, in <module>
+ from typed_ast import _ast3
+ImportError: /home/gui/.vim/black/lib/python3.7/site-packages/typed_ast/_ast3.cpython-37m-x86_64-linux-gnu.so: undefined symbool: PyExc_KeyboardInterrupt
+```
+
+Then you need to install `typed_ast` and `regex` directly from the source code. The
+error happens because `pip` will download [Python wheels](https://pythonwheels.com/) if
+they are available. Python wheels are a new standard of distributing Python packages and
+packages that have Cython and extensions written in C are already compiled, so the
+installation is much more faster. The problem here is that somehow the Python
+environment inside Vim does not match with those already compiled C extensions and these
+kind of errors are the result. Luckily there is an easy fix: installing the packages
+from the source code.
+
+The two packages that cause the problem are:
+
+- [regex](https://pypi.org/project/regex/)
+- [typed-ast](https://pypi.org/project/typed-ast/)
+
+Now remove those two packages:
+
+```console
+$ pip uninstall regex typed-ast -y
+```
+
+And now you can install them with:
+
+```console
+$ pip install --no-binary :all: regex typed-ast
+```
+
+The C extensions will be compiled and now Vim's Python environment will match. Note that
+you need to have the GCC compiler and the Python development files installed (on
+Ubuntu/Debian do `sudo apt-get install build-essential python3-dev`).
+
+If you later want to update _Black_, you should do it like this:
+
+```console
+$ pip install -U black --no-binary regex,typed-ast
+```
+
### Visual Studio Code
Use the
### Kakoune
-Add the following hook to your kakrc, then run black with `:format`.
+Add the following hook to your kakrc, then run _Black_ with `:format`.
```
hook global WinSetOption filetype=python %{
There is no official blackd client tool (yet!). You can test that blackd is working
using `curl`:
-```
+```sh
blackd --bind-port 9090 & # or let blackd choose a port
curl -s -XPOST "localhost:9090" -d "print('valid')"
```
The response headers include a `X-Black-Version` header containing the version of
_Black_.
+## black-primer
+
+`black-primer` is a tool built for CI (and huumans) to have _Black_ `--check` a number
+of (configured in `primer.json`) Git accessible projects in parallel. _(A PR will be
+accepted to add Mercurial support.)_
+
+### Run flow
+
+- Ensure we have a `black` + `git` in PATH
+- Load projects from `primer.json`
+- Run projects in parallel with `--worker` workers (defaults to CPU count / 2)
+ - Checkout projects
+ - Run black and record result
+ - Clean up repository checkout _(can optionally be disabled via `--keep`)_
+- Display results summary to screen
+- Default to cleaning up `--work-dir` (which defaults to tempfile schemantics)
+- Return
+ - 0 for successful run
+ - < 0 for environment / internal error
+ - > 0 for each project with an error
+
+### Speed up Runs 🏎
+
+If you're running locally yourself to test black on lots of code try:
+
+- Using `-k` / `--keep` + `-w` / `--work-dir` so you don't have to re-checkout the repo
+ each run
+
+### CLI Arguments
+
+```text
+Usage: black-primer [OPTIONS]
+
+ primer - prime projects for blackening... 🏴
+
+Options:
+ -c, --config PATH JSON config file path [default: /Users/cooper/repos/
+ black/src/black_primer/primer.json]
+
+ --debug Turn on debug logging [default: False]
+ -k, --keep Keep workdir + repos post run [default: False]
+ -L, --long-checkouts Pull big projects to test [default: False]
+ -R, --rebase Rebase project if already checked out [default:
+ False]
+
+ -w, --workdir PATH Directory Path for repo checkouts [default: /var/fol
+ ders/tc/hbwxh76j1hn6gqjd2n2sjn4j9k1glp/T/primer.20200
+ 517125229]
+
+ -W, --workers INTEGER Number of parallel worker coroutines [default: 69]
+ -h, --help Show this message and exit.
+```
+
+### primer config file
+
+The config is JSON format. Its main element is the `"projects"` dictionary. Below
+explains each parameter:
+
+```json
+{
+ "projects": {
+ "00_Example": {
+ "cli_arguments": "List of extra CLI arguments to pass Black for this project",
+ "expect_formatting_changes": "Boolean to indicate that the version of Black is expected to cause changes",
+ "git_clone_url": "URL you would pass `git clone` to check out this repo",
+ "long_checkout": "Boolean to have repo skipped by defauult unless `--long-checkouts` is specified",
+ "py_versions": "List of major Python versions to run this project with - all will do as you'd expect - run on ALL versions"
+ },
+ "aioexabgp": {
+ "cli_arguments": [],
+ "expect_formatting_changes": true,
+ "git_clone_url": "https://github.com/cooperlees/aioexabgp.git",
+ "long_checkout": false,
+ "py_versions": ["all", "3.8"] // "all" ignores all other versions
+ }
+ }
+}
+```
+
+### Example run
+
+```console
+cooper-mbp:black cooper$ ~/venvs/b/bin/black-primer
+[2020-05-17 13:06:40,830] INFO: 4 projects to run Black over (lib.py:270)
+[2020-05-17 13:06:44,215] INFO: Analyzing results (lib.py:285)
+-- primer results 📊 --
+
+3 / 4 succeeded (75.0%) ✅
+1 / 4 FAILED (25.0%) 💩
+ - 0 projects disabled by config
+ - 0 projects skipped due to Python version
+ - 0 skipped due to long checkout
+
+Failed projects:
+
+## flake8-bugbear:
+ - Returned 1
+ - stdout:
+--- tests/b303_b304.py 2020-05-17 20:04:09.991227 +0000
++++ tests/b303_b304.py 2020-05-17 20:06:42.753851 +0000
+@@ -26,11 +26,11 @@
+ maxint = 5 # this is okay
+ # the following shouldn't crash
+ (a, b, c) = list(range(3))
+ # it's different than this
+ a, b, c = list(range(3))
+- a, b, c, = list(range(3))
++ a, b, c = list(range(3))
+ # and different than this
+ (a, b), c = list(range(3))
+ a, *b, c = [1, 2, 3, 4, 5]
+ b[1:3] = [0, 0]
+
+would reformat tests/b303_b304.py
+Oh no! 💥 💔 💥
+1 file would be reformatted, 22 files would be left unchanged.
+```
+
## Version control integration
Use [pre-commit](https://pre-commit.com/). Once you
example.
If you're already using Python 3.7, switch the `language_version` accordingly. Finally,
-`stable` is a tag that is pinned to the latest release on PyPI. If you'd rather run on
+`stable` is a branch that tracks the latest release on PyPI. If you'd rather run on
master, this is also an option.
## Ignoring unmodified files
The following notable open-source projects trust _Black_ with enforcing a consistent
code style: pytest, tox, Pyramid, Django Channels, Hypothesis, attrs, SQLAlchemy,
-Poetry, PyPA applications (Warehouse, Pipenv, virtualenv), pandas, Pillow, every Datadog
-Agent Integration, Home Assistant.
+Poetry, PyPA applications (Warehouse, Bandersnatch, Pipenv, virtualenv), pandas, Pillow,
+every Datadog Agent Integration, Home Assistant.
+
+The following organizations use _Black_: Facebook, Dropbox.
Are we missing anyone? Let us know.
not ready to embrace _Black_ yet. Such changes are unlikely to get accepted. You can
still try but prepare to be disappointed.
-More details can be found in [CONTRIBUTING](CONTRIBUTING.md).
+More details can be found in
+[CONTRIBUTING](https://github.com/psf/black/blob/master/CONTRIBUTING.md).
## Change Log
The log's become rather long. It moved to its own file.
-See [CHANGES](CHANGES.md).
+See [CHANGES](https://github.com/psf/black/blob/master/CHANGES.md).
## Authors
projects / etc / vim.git / blobdiff