def _get_mro(obj_class):
    if not hasattr(obj_class, '__mro__'):
        # Old-style class. Mix in object to make a fake new-style class.
        try:
            obj_class = type(obj_class.__name__, (obj_class, object), {})
        except TypeError:
            # Old-style extension type that does not descend from object.
            # FIXME: try to construct a more thorough MRO.
            mro = [obj_class]
        else:
            mro = obj_class.__mro__[1:-1]
    else:
        mro = obj_class.__mro__
    return mro
Get a reasonable method resolution order of a class and its superclasses
dataset/ETHPy150Open ipython/ipython-py3k/IPython/lib/pretty.py/_get_mro