Register the pyFlakes checker into PEP8 set of checks.

def _register_pyflakes_check():
    """Register the pyFlakes checker into PEP8 set of checks."""
    from flake8_isort import Flake8Isort
    from flake8_blind_except import check_blind_except

    # Resolving conflicts between pep8 and pyflakes.
    codes = {
        "UnusedImport": "F401",
        "ImportShadowedByLoopVar": "F402",
        "ImportStarUsed": "F403",
        "LateFutureImport": "F404",
        "Redefined": "F801",
        "RedefinedInListComp": "F812",
        "UndefinedName": "F821",
        "UndefinedExport": "F822",
        "UndefinedLocal": "F823",
        "DuplicateArgument": "F831",
        "UnusedVariable": "F841",
    }

    for name, obj in vars(pyflakes.messages).items():
        if name[0].isupper() and obj.message:
            obj.tpl = "{0} {1}".format(codes.get(name, "F999"), obj.message)

    pep8.register_check(_PyFlakesChecker, codes=['F'])
    # FIXME parser hack
    parser = pep8.get_parser('', '')
    Flake8Isort.add_options(parser)
    options, args = parser.parse_args([])
    # end of hack
    pep8.register_check(Flake8Isort, codes=['I'])
    pep8.register_check(check_blind_except, codes=['B90'])