Pylama

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

PEP8 © 2012-2013, Florent Xicluna;
PEP257 © 2012, GreenSteam, <http://greensteam.dk/>
PyFlakes © 2005-2013, Kevin Watters;
Mccabe © Ned Batchelder;
Pylint © 2013, Logilab (should be installed 'pylama_pylint' module);
gjslint © The Closure Linter Authors (should be installed 'pylama_gjslint' module);

Pylint isn't supported in Python 3.

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

Contents

Requirements:
Instalation:
Quickstart
Set Pylama (checkers) options
Pytest integration
Writing a linter

Requirements:

Python (2.6, 2.7, 3.2, 3.3)
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)

Instalation:

Pylama could be installed using pip: ::

$ pip install pylama

Quickstart

Pylama is easy to use and realy fun for checking code quality. Just run pylama and get common output from all pylama plugins (PEP8, 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 "pep8,mccabe"

Choose code chekers for JavaScript:

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

Set Pylama (checkers) options

Command line options

$ pylama --help

usage: pylama [-h] [--verbose] [--version] [--format {pep8,pylint}]
            [--select SELECT] [--linters LINTERS] [--ignore IGNORE]
            [--skip SKIP] [--report REPORT] [--hook] [--async]
            [--options OPTIONS] [--force]
            [path]

Code audit tool for python.

positional arguments:
path                  Path on file or directory 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,pylint}, -f {pep8,pylint}
                        Choose errors format (pep8, pylint).
--select SELECT, -s SELECT
                        Select errors and warnings. (comma-separated list)
--linters LINTERS, -l LINTERS
                        Select linters. (comma-separated).
--ignore IGNORE, -i IGNORE
                        Ignore errors and warnings. (comma-separated list)
--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.
--async               Enable async mode. Usefull for checking a lot of
                        files. Dont supported with pylint.
--options OPTIONS, -o OPTIONS
                        Select configuration file. By default is
                        '<CURDIR>/pylama.ini'
--force, -F           Force code checking (if linter doesnt allow)

File modelines

You can set options for Pylama inside a source files. 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

The options have a must higher priority.

Skip lines (noqa)

Just add # noqa in end of line for ignore.

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

Configuration files

When starting Pylama try loading configuration file.

The programm 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

You could set configuration file manually by "-o" option.

Pylama search sections with name starts pylama.

Section pylama contains a 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:pep8]
max_line_length = 100

[pylama:pylint]
max_line_length = 100
disable = R

See code checkers documentation for more info.

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 have Pytest support. The package automatically register self as pytest plugin when during installation. Also pylama suports pytest_cache plugin.

Check files with pylama

pytest --pylama ...

Recomended way to settings pyalam 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' should be defined 'pylama.linter' entry point.

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

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

'allow' take a path and returned true if linter could check this file for errors. 'run' take a path and meta keywords params and return list of errors.

Example:

Just 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

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

bubenkoff/pylama