py.test plugin for checking PEP8 source code compliance using the pep8 module.


install via:

easy_install pytest-pep8 # or
pip install pytest-pep8

and then type:

py.test --pep8

to activate source code checking. Every file ending in .py will be discovered and checked, starting from the command line arguments. For example, if you have a file like this:

# content of

somefunc( 123,456)

you can run it with:

$ py.test --pep8
=========================== test session starts ============================
platform linux2 -- Python 2.6.5 -- pytest-2.0.1.dev1
pep8 ignore opts: (performing all available checks)
collecting ... collected 1 items F

================================= FAILURES =================================
________________________________ PEP8-check ________________________________
/tmp/doc-exec-20/ E201 whitespace after '('
somefunc( 123,456)
/tmp/doc-exec-20/ E231 missing whitespace after ','
somefunc( 123,456)

========================= 1 failed in 0.01 seconds =========================

In the testing header you will always see the list of pep8 checks that are ignored (non by default). For the meaning of these error and warning codes, see the error output when running against your files or checkout

Configuring PEP8 options per-project

You may configure PEP8-checking options for your project by adding an pep8ignore entry to your pytest.ini or setup.cfg file like this:

# content of pytest.ini
pep8ignore = E201 E231

You may also omit paths from PEP8 this can be useful for generated code:

pep8omit =

This would prevent complaints about some whitespace issues (see above). Rerunning it with the above example will now look better:

$ py.test -q --pep8
collecting ... collected 1 items
1 passed in 0.01 seconds

Running PEP8 checks and no other tests

You can also restrict your test run to only perform "pep8" tests and not any other tests by typing:

py.test --pep8 -k pep8

This will only run tests that are marked with the "pep8" keyword which is added for the pep8 test items added by this plugin.


The repository of this plugin is at

For more info on py.test see

The code is partially based on Ronny Pfannschmidt's pytest-codecheckers plugin.