def _always_object(classes):
    """
    Ensure object appears in the mro even
    for old-style classes.
    """
    if object not in classes:
        return classes + (object,)
    return classes

    Ensure object appears in the mro even
    for old-style classes.
    
stackoverflow/venv/lib/python3.6/site-packages/pip-19.0.3-py3.6.egg/pip/_vendor/pkg_resources/__init__.py