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pep8 - Python style guide checker
=================================
pep8 is a tool to check your Python code against some of the style
conventions in `PEP 8`_.
.. _PEP 8: http://www.python.org/dev/peps/pep-0008/
Mailing List
------------
http://groups.google.com/group/pep8
Features
--------
* Plugin architecture: Adding new checks is easy.
* Parseable output: Jump to error location in your editor.
* Small: Just one Python file, requires only stdlib. You can use just
the pep8.py file for this purpose.
* Comes with a comprehensive test suite.
Installation
------------
You can install, upgrade, uninstall pep8.py with these commands::
$ pip install pep8
$ pip install --upgrade pep8
$ pip uninstall pep8
There's also a package for Debian/Ubuntu, but it's not always the
latest version::
$ sudo apt-get install pep8
Example usage and output
------------------------
::
$ pep8 --first optparse.py
optparse.py:69:11: E401 multiple imports on one line
optparse.py:77:1: E302 expected 2 blank lines, found 1
optparse.py:88:5: E301 expected 1 blank line, found 0
optparse.py:222:34: W602 deprecated form of raising exception
optparse.py:347:31: E211 whitespace before '('
optparse.py:357:17: E201 whitespace after '{'
optparse.py:472:29: E221 multiple spaces before operator
optparse.py:544:21: W601 .has_key() is deprecated, use 'in'
You can also make pep8.py show the source code for each error, and
even the relevant text from PEP 8::
$ pep8 --show-source --show-pep8 testsuite/E40.py
testsuite/E40.py:2:10: E401 multiple imports on one line
import os, sys
^
Imports should usually be on separate lines.
Okay: import os\nimport sys
E401: import sys, os
Or you can display how often each error was found::
$ pep8 --statistics -qq Python-2.5/Lib
232 E201 whitespace after '['
599 E202 whitespace before ')'
631 E203 whitespace before ','
842 E211 whitespace before '('
2531 E221 multiple spaces before operator
4473 E301 expected 1 blank line, found 0
4006 E302 expected 2 blank lines, found 1
165 E303 too many blank lines (4)
325 E401 multiple imports on one line
3615 E501 line too long (82 characters)
612 W601 .has_key() is deprecated, use 'in'
1188 W602 deprecated form of raising exception
Quick help is available on the command line::
$ pep8 -h
Usage: pep8 [options] input ...
Options:
--version show program's version number and exit
-h, --help show this help message and exit
-v, --verbose print status messages, or debug with -vv
-q, --quiet report only file names, or nothing with -qq
-r, --repeat (obsolete) show all occurrences of the same error
--first show first occurrence of each error
--exclude=patterns exclude files or directories which match these comma
separated patterns (default: .svn,CVS,.bzr,.hg,.git)
--filename=patterns when parsing directories, only check filenames matching
these comma separated patterns (default: *.py)
--select=errors select errors and warnings (e.g. E,W6)
--ignore=errors skip errors and warnings (e.g. E4,W)
--show-source show source code for each error
--show-pep8 show text of PEP 8 for each error (implies --first)
--statistics count errors and warnings
--count print total number of errors and warnings to standard
error and set exit code to 1 if total is not null
--max-line-length=n set maximum allowed line length (default: 79)
--format=format set the error format [default|pylint|<custom>]
--diff report only lines changed according to the unified diff
received on STDIN
Testing Options:
--testsuite=dir run regression tests from dir
--doctest run doctest on myself
--benchmark measure processing speed
Configuration:
The project options are read from the [pep8] section of the .pep8 file
located in any parent folder of the path(s) being processed. Allowed
options are: exclude, filename, select, ignore, max-line-length,
count, format, quiet, show-pep8, show-source, statistics, verbose.
--config=path config file location (default: /home/user/.config/pep8)
Calling `pep8` from Python
--------------------------
You can also execute `pep8` tests from Python code. For example, this
can be highly useful for automated testing of coding style conformance
in your project::
import unittest
import pep8
class TestCodeFormat(unittest.TestCase):
def test_pep8_conformance(self):
"""Test that we conform to PEP8."""
pep8style = pep8.StyleGuide(quiet=True)
result = pep8style.check_files(['file1.py', 'file2.py'])
self.assertEqual(result.total_errors, 0,
"Found code style errors (and warnings).")
If you are using `nosetests` for running tests, remove `quiet=True`
since Nose suppresses stdout.
There's also a shortcut for checking a single file::
import pep8
fchecker = pep8.Checker('testsuite/E27.py', show_source=True)
file_errors = fchecker.check_all()
print("Found %s errors (and warnings)" % file_errors)
Feedback
--------
Your feedback is more than welcome. Post bugs and feature requests on github:
http://github.com/jcrocholl/pep8/issues
Source download
---------------
.. image:: https://secure.travis-ci.org/jcrocholl/pep8.png?branch=master
:target: https://secure.travis-ci.org/jcrocholl/pep8
:alt: Build status
The source code is currently available on github. Fork away!
http://github.com/jcrocholl/pep8/
Then be sure to pass the tests::
$ python pep8.py --testsuite testsuite
$ python pep8.py --doctest
$ python pep8.py --verbose pep8.py
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