python中 a += 1 调研那些魔法函数？

来魔法都在这里。

https://developer.aliyun.com/article/674148?utm_content=g_1000086983

这是一个操作符重载，重载的为__iadd__

# -*- coding: utf-8 -*-


class Student:
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def __iadd__(self, other):
        self.age += 1
        return self

    def __str__(self):
        return "Student [name:{N}] [age:{A}]".format(N=self.name, A=self.age)


if __name__ == '__main__':
    s = Student("Tom", 18)
    s += 1
    print(s)

给你发个教程网址把,看你挺着急的
http://www.runoob.com/python3/python3-tutorial.html

__iadd__(self, other)
实现加法赋值操作。

调研 --> 调用?
+= 调用的是 __iadd__, link: https://docs.python.org/3.4/library/operator.html#operator.iadd