pylama 7.7.0

Home-page: https://github.com/klen/pylama
Author: Kirill Klenov
Author-email: horneds@gmail.com
License: GNU LGPL
Description: |logo| Pylama
#############

.. _description:

Code audit tool for Python and JavaScript. Pylama wraps these tools:

* pycodestyle_ (formerly pep8) © 2012-2013, Florent Xicluna;
* pydocstyle_ (formerly pep257 by Vladimir Keleshev) © 2014, Amir Rachum;
* PyFlakes_ © 2005-2013, Kevin Watters;
* Mccabe_ © Ned Batchelder;
* Pylint_ © 2013, Logilab (should be installed 'pylama_pylint' module);
* Radon_ © Michele Lacchia
* gjslint_ © The Closure Linter Authors (should be installed 'pylama_gjslint' module);
* eradicate_ © Steven Myint;
* Mypy_ © Jukka Lehtosalo and contributors;

.. _badges:

.. image:: http://img.shields.io/travis/klen/pylama.svg?style=flat-square
:target: http://travis-ci.org/klen/pylama
:alt: Build Status

.. image:: http://img.shields.io/coveralls/klen/pylama.svg?style=flat-square
:target: https://coveralls.io/r/klen/pylama
:alt: Coverals

.. image:: http://img.shields.io/pypi/v/pylama.svg?style=flat-square
:target: https://crate.io/packages/pylama
:alt: Version

.. image:: http://img.shields.io/gratipay/klen.svg?style=flat-square
:target: https://www.gratipay.com/klen/
:alt: Donate


.. _documentation:

Docs are available at https://pylama.readthedocs.org/. Pull requests with documentation enhancements and/or fixes are awesome and most welcome.


.. _contents:

.. contents::

.. _requirements:

Requirements:
=============

- Python (2.7, 3.4, 3.5, 3.6, 3.7)
- To use JavaScript checker (``gjslint``) you need to install ``python-gflags`` with ``pip install python-gflags``.
- If your tests are failing on Win platform you are missing: ``curses`` - http://www.lfd.uci.edu/~gohlke/pythonlibs/
(The curses library supplies a terminal-independent screen-painting and keyboard-handling facility for text-based terminals)


.. _installation:

Installation:
=============
**Pylama** could be installed using pip: ::
::

$ pip install pylama


.. _quickstart:

Quickstart
==========

**Pylama** is easy to use and really fun for checking code quality.
Just run `pylama` and get common output from all pylama plugins (pycodestyle_, PyFlakes_ and etc)

Recursive check the current directory. ::

$ pylama

Recursive check a path. ::

$ pylama <path_to_directory_or_file>

Ignore errors ::

$ pylama -i W,E501

.. note:: You could choose a group erros `D`,`E1` and etc or special errors `C0312`

Choose code checkers ::

$ pylama -l "pycodestyle,mccabe"

Choose code checkers for JavaScript::

$ pylama --linters=gjslint --ignore=E:0010 <path_to_directory_or_file>

.. _options:

Set Pylama (checkers) options
=============================

Command line options
--------------------

::

$ pylama --help

usage: pylama [-h] [--verbose] [--version]
[--format {pep8,pycodestyle,pylint,parsable}] [--select SELECT]
[--sort SORT] [--linters LINTERS] [--ignore IGNORE]
[--skip SKIP] [--report REPORT] [--hook] [--concurrent]
[--options FILE] [--force] [--abspath]
[paths [paths ...]]

Code audit tool for python.

positional arguments:
paths Paths to files or directories for code check.

optional arguments:
-h, --help show this help message and exit
--verbose, -v Verbose mode.
--version show program's version number and exit
--format {pep8,pycodestyle,pylint,parsable}, -f {pep8,pycodestyle,pylint,parsable}
Choose errors format (pycodestyle, pylint, parsable).
--select SELECT, -s SELECT
Select errors and warnings. (comma-separated list)
--sort SORT Sort result by error types. Ex. E,W,D
--linters LINTERS, -l LINTERS
Select linters. (comma-separated). Choices are mccabe,
pep257,pydocstyle,pep8,pycodestyle,pyflakes,pylint,iso
rt.
--ignore IGNORE, -i IGNORE
Ignore errors and warnings. (comma-separated)
--skip SKIP Skip files by masks (comma-separated, Ex.
*/messages.py)
--report REPORT, -r REPORT
Send report to file [REPORT]
--hook Install Git (Mercurial) hook.
--concurrent, --async
Enable async mode. Useful for checking a lot of files.
Unsupported with pylint.
--options FILE, -o FILE
Specify configuration file. Looks for pylama.ini,
setup.cfg, tox.ini, or pytest.ini in the current
directory (default: None).
--force, -F Force code checking (if linter doesn't allow)
--abspath, -a Use absolute paths in output.


.. _modeline:

File modelines
--------------

You can set options for **Pylama** inside a source file. Use
pylama *modeline* for this.

Format: ::

# pylama:{name1}={value1}:{name2}={value2}:...


::

.. Somethere in code
# pylama:ignore=W:select=W301


Disable code checking for current file: ::

.. Somethere in code
# pylama:skip=1

Those options have a higher priority.

.. _skiplines:

Skip lines (noqa)
-----------------

Just add `# noqa` in end of line to ignore.

::

def urgent_fuction():
unused_var = 'No errors here' # noqa


.. _config:

Configuration file
------------------

**Pylama** looks for a configuration file in the current directory.

The program searches for the first matching ini-style configuration file in
the directories of command line argument. Pylama looks for the configuration
in this order: ::

pylama.ini
setup.cfg
tox.ini
pytest.ini

The "--option" / "-o" argument can be used to specify a configuration file.

Pylama searches for sections whose names start with `pylama`.

The "pylama" section configures global options like `linters` and `skip`.

::

[pylama]
format = pylint
skip = */.tox/*,*/.env/*
linters = pylint,mccabe
ignore = F0401,C0111,E731

Set Code-checkers' options
--------------------------

You could set options for special code checker with pylama configurations.

::

[pylama:pyflakes]
builtins = _

[pylama:pycodestyle]
max_line_length = 100

[pylama:pylint]
max_line_length = 100
disable = R

See code-checkers' documentation for more info. Let's notice that dashes are
replaced by underscores (e.g. Pylint's "max-line-length" becomes
"max_line_length").


Set options for file (group of files)
-------------------------------------

You could set options for special file (group of files)
with sections:

The options have a higher priority than in the `pylama` section.

::

[pylama:*/pylama/main.py]
ignore = C901,R0914,W0212
select = R

[pylama:*/tests.py]
ignore = C0110

[pylama:*/setup.py]
skip = 1


Pytest integration
==================

Pylama has Pytest_ support. The package automatically registers itself as a pytest
plugin during installation. Pylama also supports `pytest_cache` plugin.

Check files with pylama ::

pytest --pylama ...

Recommended way to set pylama options when using pytest — configuration
files (see below).


Writing a linter
================

You can write a custom extension for Pylama.
Custom linter should be a python module. Name should be like 'pylama_<name>'.

In 'setup.py', 'pylama.linter' entry point should be defined. ::

setup(
# ...
entry_points={
'pylama.linter': ['lintername = pylama_lintername.main:Linter'],
}
# ...
)

'Linter' should be instance of 'pylama.lint.Linter' class.
Must implement two methods:

'allow' takes a path and returns true if linter can check this file for errors.
'run' takes a path and meta keywords params and returns a list of errors.

Example:
--------

Just a virtual 'WOW' checker.

setup.py: ::

setup(
name='pylama_wow',
install_requires=[ 'setuptools' ],
entry_points={
'pylama.linter': ['wow = pylama_wow.main:Linter'],
}
# ...
)

pylama_wow.py: ::

from pylama.lint import Linter as BaseLinter

class Linter(BaseLinter):

def allow(self, path):
return 'wow' in path

def run(self, path, **meta):
with open(path) as f:
if 'wow' in f.read():
return [{
lnum: 0,
col: 0,
text: 'Wow has been finded.',
type: 'WOW'
}]


Run pylama from python code
---------------------------
::

from pylama.main import check_path, parse_options

# Use and/or modify 0 or more of the options defined as keys in the variable my_redefined_options below.
# To use defaults for any option, remove that key completely.
my_redefined_options = {
'linters': ['pep257', 'pydocstyle', 'pycodestyle', 'pyflakes' ...],
'ignore': ['D203', 'D213', 'D406', 'D407', 'D413' ...],
'select': ['R1705' ...],
'sort': 'F,E,W,C,D,...',
'skip': '*__init__.py,*/test/*.py,...',
'async': True,
'force': True
...
}
# relative path of the directory in which pylama should check
my_path = '...'

options = parse_options([my_path], **my_redefined_options)
errors = check_path(options, rootdir='.')


.. _bagtracker:

Bug tracker
-----------

If you have any suggestions, bug reports or annoyances please report them to the issue tracker at https://github.com/klen/pylama/issues


.. _contributing:

Contributing
------------

Development of `pylama` happens at GitHub: https://github.com/klen/pylama


.. _contributors:

Contributors
^^^^^^^^^^^^

See AUTHORS_.


.. _license:

License
-------

Licensed under a `BSD license`_.


.. _links:

.. _AUTHORS: https://github.com/klen/pylama/blob/develop/AUTHORS
.. _BSD license: http://www.linfo.org/bsdlicense.html
.. _Mccabe: http://nedbatchelder.com/blog/200803/python_code_complexity_microtool.html
.. _pydocstyle: https://github.com/PyCQA/pydocstyle/
.. _pycodestyle: https://github.com/PyCQA/pycodestyle
.. _PyFlakes: https://github.com/pyflakes/pyflakes
.. _Pylint: http://pylint.org
.. _Pytest: http://pytest.org
.. _gjslint: https://developers.google.com/closure/utilities
.. _klen: http://klen.github.io/
.. _eradicate: https://github.com/myint/eradicate
.. _Mypy: https://github.com/python/mypy

.. |logo| image:: https://raw.github.com/klen/pylama/develop/docs/_static/logo.png
:width: 100
.. _Radon: https://github.com/rubik/radon


Keywords: pylint,pep8,pycodestyle,pyflakes,mccabe,linter,qa,pep257,pydocstyle
Platform: Any
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Classifier: Topic :: Software Development :: Quality Assurance
Classifier: Development Status :: 4 - Beta
Classifier: Environment :: Console
Classifier: Intended Audience :: Developers
Classifier: Intended Audience :: System Administrators
Classifier: License :: OSI Approved :: GNU Library or Lesser General Public License (LGPL)
Classifier: Natural Language :: English
Classifier: Natural Language :: Russian
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python
Classifier: Topic :: Software Development :: Code Generators