嵌套列表深度--Python

求一个嵌套列表的深度

def depth_count(data, max_depth=0):
    if not data or not isinstance(data, list):
        return max_depth
    l = depth_count(data[0], max_depth + 1)
    r = depth_count(data[1:], max_depth)
    return max(l, r)


if __name__ == '__main__':
    datas = [1, [22, [33, 44, [66], 77]]]
    print(depth_count(datas))