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