__call__, __str__

一个类实例也可以变成一个可调用对象，只需要实现一个特殊方法__call__()

class People:

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

    def __str__(self):
        return "his name is %s" % self.name

    def __call__(self, gender):
        print("he is a " + gender)


human1 = People("jack", 34)
print(human1)   # 当使用print输出对象的时候，只要自己定义了__str__(self)方法，那么就会打印从在这个方法中return的数据
human1("male")  # 可直接对实例进行调用，就像使用函数一样

输出

his name is jack
he is a male

参考：

https://www.runoob.com/note/41154

https://www.cnblogs.com/superxuezhazha/p/5793536.html

https://blog.csdn.net/Nekocharm/article/details/98326720