python对象之__call__方法

Posted 2020-11-26

先看示例，然后啥都明白了

class Student():
    def __call__(self, *args, **kwargs):
        print(‘__call__方法被调用‘, *args)

class Person():
    def mm(self):
        print(‘mm方法被调用‘)

测试代码 ：

from test.student import Student, Person

if __name__ == ‘__main__‘:
    student =Student()
    student(‘ni nai nai de ‘)

    print(‘*‘*40)
    person = Person()
    person()

打印结果：

C:UserszhengqinfengAppDataLocalProgramsPythonPython37python.exe E:/ws/python/LearnFlask/test/xx.py
Traceback (most recent call last):
__call__方法被调用 ni nai nai de 
  File "E:/ws/python/LearnFlask/test/xx.py", line 9, in <module>
****************************************
    person()
TypeError: ‘Person‘ object is not callable

Process finished with exit code 1

 

结论： Student对象的正常调用，而Person调用报错，一切都是因为__call__方法，  它就是对象的回调方法。。。。