def remove_parents(bases):
    """ removes the parent classes if one base is subclass of
        another"""
    if len(bases) < 2:
        return bases
    remove_i = []
    bases = list(bases)
    for i, base in enumerate(bases):
        for j, other in enumerate(bases):
            # print(i, j, base, other, remove_i)
            if j != i and (issubclass(other, base) or base == other):
                remove_i.append(i)
    remove_i = set(remove_i)
    remove_i = [i for i in remove_i]
    remove_i.sort(reverse=True)
    for index in remove_i:
        try:
            del bases[index]
        except IndexError:
            print("Unable to delete base: ", bases)
    return bases
removes the parent classes if one base is subclass of
        another