If the object is a type or class object, the list contains the names of its attributes, and recursively of the attributes of its bases.
If the object is a type or class object, the list contains the names of its attributes, and recursively of the attributes of its bases.
如果是类型或类对象，列表将会包含它们的属性名称并且递归地包含基类(型)的属性。