def get_all_subclasses(cls, subclasses=None):
    """Return all subclasses list for given class."""
    subclasses = subclasses or set()
    for child_cls in cls.__subclasses__():
        if child_cls not in subclasses:
            subclasses.add(child_cls)
            get_all_subclasses(child_cls, subclasses)
    return list(subclasses)