013:class and objects > Simple inheritance

1. All classes are inherited directly or indirectly with object.

2. The super () method can be used to access the methods of the parent class, and if the subclass has a method with the same name as the parent class, the subclass overrides the method of the parent class.

3. After the definition of a class-level member, all descendants share a class-level member

classContact (object):#class-Level member variablesContact_list = []    def __init__(self, name, email, telephone):#member variables at the object levelSelf.name =name Self.email=Email Self.telephone=telephone Contact.contact_list.append (self) contact_a= Contact ('Tom','[email protected]', 123456) Contact_b= Contact ('Lucy','[email protected]', 123457)Print('Contact :') forCinchcontact.contact_list:Print(c.name)classFriend (Contact): Friend_list= []    #overriding methods of the parent class    def __init__(self, name, e-mail, telephone, age):#calling a method of the parent classSuper (Friend, self).__init__(name, email, telephone) self.age=Age Friend.friend_list.append (self) friend_a= Friend ('Jack','[email protected]', 123458, 22) Friend_b= Friend ('Jim','[email protected]', 123459, 23)    #It's a little strange that the child class has quite the same contact_listPrint(contact.contact_list)Print(friend.contact_list)Print('Friends:') forFinchfriend.friend_list:Print(F.name, F.age)

013:class and objects > Simple inheritance