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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:

Mailing List


  • 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 file for this purpose.

  • Comes with a comprehensive test suite.


You can install, upgrade, uninstall 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 E401 multiple imports on one line E302 expected 2 blank lines, found 1 E301 expected 1 blank line, found 0 W602 deprecated form of raising exception E211 whitespace before ‘(’ E201 whitespace after ‘{’ E221 multiple spaces before operator W601 .has_key() is deprecated, use ‘in’

You can also make show the source code for each error, and even the relevant text from PEP 8::

$ pep8 –show-source –show-pep8 testsuite/ testsuite/ 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|] –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

  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)


Your feedback is more than welcome. Write email to [email protected] or post bugs and feature requests on github:

Source download

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The source code is currently available on github. Fork away!

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