source on standard input).
-S, --skip-string-normalization
Don't normalize string quotes or prefixes.
+ -N, --skip-numeric-underscore-normalization
+ Don't normalize underscores in numeric literals.
--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
directories that should be excluded on
recursive searches. On Windows, use forward
slashes for directories. [default:
- build/|buck-out/|dist/|_build/|\.git/|\.hg/|
- \.mypy_cache/|\.tox/|\.venv/]
+ build/|buck-out/|dist/|_build/|\.eggs/|\.git/|
+ \.hg/|\.mypy_cache/|\.nox/|\.tox/|\.venv/]
-q, --quiet Don't emit non-error messages to stderr. Errors
are still emitted, silence those with
2>/dev/null.
*Black* reformats entire files in place. It is not configurable. It
doesn't take previous formatting into account. It doesn't reformat
-blocks that start with `# fmt: off` and end with `# fmt: on`. It also
+blocks that start with `# fmt: off` and end with `# fmt: on`. `# fmt: on/off`
+have to be on the same level of indentation. It also
recognizes [YAPF](https://github.com/google/yapf)'s block comments to
the same effect, as a courtesy for straddling code.
multi_line_output=3
include_trailing_comma=True
force_grid_wrap=0
-combine_as_imports=True
+use_parentheses=True
line_length=88
```
The equivalent command line is:
```
-$ isort --multi-line=3 --trailing-comma --force-grid-wrap=0 --combine-as --line-width=88 [ file.py ]
+$ isort --multi-line=3 --trailing-comma --force-grid-wrap=0 --use-parentheses --line-width=88 [ file.py ]
```
</details>
```
You'll find *Black*'s own .flake8 config file is configured like this.
-If you're curious about the reasoning behind B950, Bugbear's documentation
+If you're curious about the reasoning behind B950,
+[Bugbear's documentation](https://github.com/PyCQA/flake8-bugbear#opinionated-warnings)
explains it. The tl;dr is "it's like highway speed limits, we won't
bother you if you overdo it by a few km/h".
[#26](https://github.com/ambv/black/issues/26) for details).
Why settle on double quotes? They anticipate apostrophes in English
-text. They match the docstring standard described in PEP 257. An
-empty string in double quotes (`""`) is impossible to confuse with
+text. They match the docstring standard described in [PEP 257](https://www.python.org/dev/peps/pep-0257/#what-is-a-docstring).
+An empty string in double quotes (`""`) is impossible to confuse with
a one double-quote regardless of fonts and syntax highlighting used.
On top of this, double quotes for strings are consistent with C which
Python interacts a lot with.
### Numeric literals
-*Black* standardizes most numeric literals to use lowercase letters: `0xab`
+*Black* standardizes most numeric literals to use lowercase letters for the
+syntactic parts and uppercase letters for the digits themselves: `0xAB`
instead of `0XAB` and `1e10` instead of `1E10`. Python 2 long literals are
styled as `2L` instead of `2l` to avoid confusion between `l` and `1`. In
Python 3.6+, *Black* adds underscores to long numeric literals to aid
readability: `100000000` becomes `100_000_000`.
+For regions where numerals are grouped differently (like [India](https://en.wikipedia.org/wiki/Indian_numbering_system)
+and [China](https://en.wikipedia.org/wiki/Chinese_numerals#Whole_numbers)),
+the `-N` or `--skip-numeric-underscore-normalization` command line option
+makes *Black* preserve underscores in numeric literals.
+
### Line breaks & binary operators
*Black* will break a line before a binary operator when splitting a block
If you're running with `--verbose`, you will see a blue message if
a file was found and used.
+Please note `blackd` will not use `pyproject.toml` configuration.
+
### Configuration format
include = '\.pyi?$'
exclude = '''
/(
- \.git
+ \.eggs
+ | \.git
| \.hg
| \.mypy_cache
| \.tox
To install with [vim-plug](https://github.com/junegunn/vim-plug):
```
-Plug 'ambv/black',
+Plug 'ambv/black'
```
or with [Vundle](https://github.com/VundleVim/Vundle.vim):
Use [sublack plugin](https://github.com/jgirardet/sublack).
-### IPython Notebook Magic
+### Jupyter Notebook Magic
Use [blackcellmagic](https://github.com/csurfer/blackcellmagic).
### Protocol
`blackd` only accepts `POST` requests at the `/` path. The body of the request
-should contain the python source code to be formatted, encoded
+should contain the python source code to be formatted, encoded
according to the `charset` field in the `Content-Type` request header. If no
`charset` is specified, `blackd` assumes `UTF-8`.
There are a few HTTP headers that control how the source is formatted. These
correspond to command line flags for *Black*. There is one exception to this:
`X-Protocol-Version` which if present, should have the value `1`, otherwise the
-request is rejected with `HTTP 501` (Not Implemented).
+request is rejected with `HTTP 501` (Not Implemented).
The headers controlling how code is formatted are:
- `X-Skip-String-Normalization`: corresponds to the `--skip-string-normalization`
command line flag. If present and its value is not the empty string, no string
normalization will be performed.
+ - `X-Skip-Numeric-Underscore-Normalization`: corresponds to the
+ `--skip-numeric-underscore-normalization` command line flag.
- `X-Fast-Or-Safe`: if set to `fast`, `blackd` will act as *Black* does when
passed the `--fast` command line flag.
- `X-Python-Variant`: if set to `pyi`, `blackd` will act as *Black* does when
## Change Log
-### 18.8b0
+### 18.9b0
-* added `blackd`, see [its documentation](#blackd) for more info (#349)
+* numeric literals are now formatted by *Black* (#452, #461, #464, #469):
-* adjacent string literals are now correctly split into multiple lines (#463)
+ * numeric literals are normalized to include `_` separators on Python 3.6+ code
-* added `blackd`, see [its documentation](#blackd) for more info (#349)
+ * 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+ (#461)
+ * code with `_` in numeric literals is recognized as Python 3.6+
-* numeric literals are now formatted by *Black* (#452, #461, #464, #469):
+ * most letters in numeric literals are lowercased (e.g., in `1e10`, `0x01`)
- * numeric literals are normalized to include `_` separators on Python 3.6+ code
+ * hexadecimal digits are always uppercased (e.g. `0xBADC0DE`)
- * code with `_` in numeric literals is recognized as Python 3.6+
+* added `blackd`, see [its documentation](#blackd) for more info (#349)
- * most letters in numeric literals are lowercased (e.g., in `1e10` or `0xab`)
+* 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](http://mpastell.com/pweave/) and
+ [Spyder IDE](https://pythonhosted.org/spyder/) 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)
-* note: the Vim plugin stopped registering ``,=`` as a default chord as it turned out
- to be a bad idea (#415)
-
* fixed formatting of lambda expressions with default arguments (#468)
-* *Black* no longer breaks ``async for`` statements up to separate lines (#372)
+* fixed ``async for`` statements: *Black* no longer breaks them into separate
+ lines (#372)
-* fixed unstable formatting when unpacking big tuples (#267)
+* note: the Vim plugin stopped registering ``,=`` as a default chord as it turned out
+ to be a bad idea (#415)
### 18.6b4
* [Stavros Korokithakis](mailto:hi@stavros.io)
* [Sunil Kapil](mailto:snlkapil@gmail.com)
* [Vishwas B Sharma](mailto:sharma.vishwas88@gmail.com)
+* [Chuck Wooters](mailto:chuck.wooters@microsoft.com)
projects / etc / vim.git / blobdiff