Python魔术方法的三个特点

class Person(object):

    def __init__(self, name, gender):

        self.name = name

        self.gender = gender

    def __str__(self):

        return 'person: %s, %s' % (self.name, self.gender)

p = Person('zhangsan', 'male')

print(p)

#输出 person: zhangsan, male