Code audit tool for python
Project description
Code audit tool for Python. 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;
Radon © Michele Lacchia
eradicate © Steven Myint;
Mypy © Jukka Lehtosalo and contributors;
Vulture © Jendrik Seipp and contributors;
Docs are available at https://klen.github.io/pylama/. Pull requests with documentation enhancements and/or fixes are awesome and most welcome.
Requirements:
Python (3.7, 3.8, 3.9, 3.10)
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)
For python versions < 3.7 install pylama 7.7.1
Installation:
Pylama can be installed using pip:
$ pip install pylama
You may optionally install the requirements with the library:
$ pip install pylama[mypy] $ pip install pylama[pylint] $ pip install pylama[eradicate] $ pip install pylama[radon] $ pip install pylama[vulture]
Or install them all:
$ pip install pylama[all]
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, etc.)
Recursively check the current directory.
$ pylama
Recursively check a path.
$ pylama <path_to_directory_or_file>
Ignore errors
$ pylama -i W,E501
Choose code checkers
$ pylama -l "pycodestyle,mccabe"
Set Pylama (checkers) options
Command line options
$ pylama --help
usage: pylama [-h] [--version] [--verbose] [--options FILE] [--linters LINTERS] [--from-stdin] [--concurrent] [--format {pydocstyle,pycodestyle,pylint,parsable,json}] [--abspath]
[--max-line-length MAX_LINE_LENGTH] [--select SELECT] [--ignore IGNORE] [--skip SKIP] [--sort SORT] [--report REPORT] [--hook] [--max-complexity MAX_COMPLEXITY]
[--pydocstyle-convention {pep257,numpy,google}] [--pylint-confidence {HIGH,INFERENCE,INFERENCE_FAILURE,UNDEFINED}]
[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
--version show program's version number and exit
--verbose, -v Verbose mode.
--options FILE, -o FILE
Specify configuration file. Looks for pylama.ini, setup.cfg, tox.ini, or pytest.ini in the current directory (default: None)
--linters LINTERS, -l LINTERS
Select linters. (comma-separated). Choices are eradicate,mccabe,mypy,pycodestyle,pydocstyle,pyflakes,pylint,isort.
--from-stdin Interpret the stdin as a python script, whose filename needs to be passed as the path argument.
--concurrent, --async
Enable async mode. Useful for checking a lot of files.
--format {pydocstyle,pycodestyle,pylint,parsable,json}, -f {pydocstyle,pycodestyle,pylint,parsable,json}
Choose output format.
--abspath, -a Use absolute paths in output.
--max-line-length MAX_LINE_LENGTH, -m MAX_LINE_LENGTH
Maximum allowed line length
--select SELECT, -s SELECT
Select errors and warnings. (comma-separated list)
--ignore IGNORE, -i IGNORE
Ignore errors and warnings. (comma-separated)
--skip SKIP Skip files by masks (comma-separated, Ex. */messages.py)
--sort SORT Sort result by error types. Ex. E,W,D
--report REPORT, -r REPORT
Send report to file [REPORT]
--hook Install Git (Mercurial) hook.
--max-complexity MAX_COMPLEXITY
Max complexity threshold
File modelines
You can set options for Pylama inside a source file. Use a pylama modeline for this, anywhere in the file.
Format:
# pylama:{name1}={value1}:{name2}={value2}:...
For example, ignore warnings except W301:
# pylama:ignore=W:select=W301
Disable code checking for current file:
# pylama:skip=1
Those options have a higher priority.
Skip lines (noqa)
Just add # noqa at the end of a line to ignore:
def urgent_fuction():
unused_var = 'No errors here' # noqa
Configuration file
Pylama looks for a configuration file in the current directory.
You can use a “global” configuration, stored in .pylama.ini in your home directory. This will be used as a fallback configuration.
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 ~/.pylama.init
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 can set options for a special code checkers 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. Note 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 can 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 the pytest_cache plugin.
Check files with pylama
pytest --pylama ...
The recommended way to set pylama options when using pytest — configuration files (see below).
Writing a linter
You can write a custom extension for Pylama. The custom linter should be a python module. Its 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 an instance of ‘pylama.lint.Linter’ class. It must implement two methods:
allow takes a path argument and returns true if the linter can check this file for errors.
run takes a path argument and meta keyword arguments 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 found.',
type: 'WOW'
}]
Run pylama from python code
from pylama.main import check_paths, 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_paths(my_path, options, rootdir='.')
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
Development of pylama happens at GitHub: https://github.com/klen/pylama
Contributors
See AUTHORS.
License
This is free software. You are permitted to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of it, under the terms of the MIT License. See LICENSE file for the complete license.
This software is provided WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See LICENSE file for the complete disclaimer.
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