这是在类对象上调用类的函数，而不是在类的实例对象上调用类的实例的方法 https://docs.python.org/zh-cn/3/tutorial/classes.html#class-objects

In [1]: class Test:
   ...:     def test():
   ...:         pass
   ...:         

In [2]: type(Test.test)
Out[2]: function

In [3]: type(Test().test)
Out[3]: method

--
修改:freesand FROM 60.191.227.*
FROM 60.191.227.*