Nose plugin for excluding files based on python version and filename

gistfile1.py

from nose.plugins import Plugin

class PyVersion(Plugin):
    """Nose plugin that excludes files based on python version and file name

    If a filename has the format NAME.pyVERSION.py and VERSION doesn't match
    [major][minor][micro], [major][minor] or [major] the file will be excluded
    from tests.

    Example of filenames::

        file.py3.py
        file.py33.py
        file.py330.py
        file.py2.py
        file.py27.py
        file.py273.py

    """

    name = 'pyversion'

    def wantFile(self, file):
        import sys
        import re

        version = [sys.version_info.major, sys.version_info.minor,
                   sys.version_info.micro]
        if (re.match(r'^.+\.py\d+\.py$', file) and
                not re.match(r'^.+\.py{0}{1}?{2}?\.py$'.format(*version), file)):
            return False
        else:
            return None