1本文的意义
如果给已经存在的类添加新的行为，采用继承方案
如果改变已经存在类的行为，采用重写方案
2图解继承、重写与Super
注：上面代码层层关联。super()可以用到任何方法里进行调用，本文只用在了__init__方法中，通过重写和调用super，可以修改所有方法。
上面类的实例化：
3代码验证
class ContactList(list): def search(self, name): matching_contacts = [] for contact in self: if name in contact.name: matching_contacts.append(contact) return matching_contacts class Contact: all_contacts = ContactList() def __init__(self, name, email): self.name = name self.email = email self.all_contacts.append(self) class Friend(Contact): def __init__(self, name, email, phone): super().__init__(name, email) self.phone = phone contact1 = Contact("Zhang San", "ZhangSan@qq.com") contact2 = Contact("Li Si", "LiSi@qq.com") contact3 = Contact("WangWu", "WangWu@qq.com") myFriend1 = Friend("LiLi", "Lili@qq.con", 666666) myFriend2 = Friend("YueYue", "Yueyue@qq.con", 888888) In [1]: Contact.all_contacts # 列表记录了实例化的5个对象 [<__main__.Contact at 0x22d6a877048>, <__main__.Contact at 0x22d6a871fd0>, <__main__.Contact at 0x22d6a877080>, <__main__.Friend at 0x22d6a8770b8>, <__main__.Friend at 0x22d6a877160>] In [2]: [c.name for c in Contact.all_contacts.search('Li')] ['Li Si', 'LiLi'] 参考：本文参考学习《Python3 Object Oriented Programming》，根据自己理解改编，Dusty Phillips 著