Python扩展内置类

先看下面的代码&＃xff1a;

#ContactList类继承自python内置类list
class ContactList(list):def search(self, name):matching_contacts &＃61; []for contact in self:if name in contact.name:matching_contacts.append(contact)return matching_contactsclass Contact:all_contacts &＃61; ContactList()#公有类&＃xff0c;为所有类的实例对象所共享&＃xff0c;属于List的扩展类对象def __init__(self, name, email):self.name &＃61; nameself.email &＃61; emailself.all_contacts.append(self)c1 &＃61; Contact(&＃39;1 A&＃39;,&＃39;1&＃39;)
c2 &＃61; Contact(&＃39;2 A&＃39;,&＃39;1&＃39;)
c3 &＃61; Contact(&＃39;3 A&＃39;,&＃39;1&＃39;)


[c.name for c in Contact.all_contacts.search(&＃39;A&＃39;)]


输出 结果为