# black
-[![Build Status](https://travis-ci.org/ambv/black.svg?branch=master)](https://travis-ci.org/ambv/black)
+[![Build Status](https://travis-ci.org/ambv/black.svg?branch=master)](https://travis-ci.org/ambv/black) ![License: MIT](https://img.shields.io/github/license/ambv/black.svg) ![PyPI](https://img.shields.io/pypi/v/black.svg) [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/ambv/black)
> Any color you like.
--help Show this message and exit.
```
+`Black` is a well-behaved Unix-style command-line tool:
+* it does nothing if no sources are passed to it;
+* it will read from standard input and write to standard output if `-`
+ is used as the filename;
+* it only outputs messages to users on standard error.
+
## The philosophy behind *Black*
great.
```py3
# in:
+
l = [1,
2,
3,
]
# out:
+
l = [1, 2, 3]
```
brackets and put that in a separate indented line.
```py3
# in:
+
l = [[n for n in list_bosses()], [n for n in list_employees()]]
# out:
+
l = [
[n for n in list_bosses()], [n for n in list_employees()]
]
separate lines.
```py3
# in:
+
def very_important_function(template: str, *variables, file: os.PathLike, debug: bool = False):
"""Applies `variables` to the `template` and writes to `file`."""
with open(file, 'w') as f:
...
# out:
+
def very_important_function(
template: str,
*variables,
* Visual Studio Code: [joslarson.black-vscode](https://marketplace.visualstudio.com/items?itemName=joslarson.black-vscode)
+Any tool that can pipe code through *Black* using its stdio mode (just
+[use `-` as the file name](http://www.tldp.org/LDP/abs/html/special-chars.html#DASHREF2)).
+The formatted code will be returned on stdout (unless `--check` was
+passed). *Black* will still emit messages on stderr but that shouldn't
+affect your use case.
+
There is currently no integration with any other text editors. Vim and
Atom/Nuclide integration is planned by the author, others will require
external contributions.
> This vastly improves the formatting of our code. Thanks a ton!
+## Show your style
+
+Use the badge in your project's README.md:
+
+```markdown
+[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/ambv/black)
+```
+
+Looks like this: [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/ambv/black)
+
+
+
## Tests
Just run:
## Change Log
+### 18.3a4 (unreleased)
+
+* 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)
+
+
### 18.3a3
* don't remove single empty lines outside of bracketed expressions