code: def is_subclass(obj, cls):
      
      try:
          for i in obj.__bases__:
              if i is cls or isinstance(i, cls):
                  return True
          for i in obj.__bases__:
              if isinstance(i, cls):
                  return True
      except AttributeError:
          return isinstance(obj.__class__, cls)
      return False
docs: 判断某一个类或者对象是否是某一个类的子类
      :param obj: 类或对象
      :param cls: 类
      :return: True or False