Chapter XI inheritance, class

Chapter XI inheritance, class

First, what is inherited

Inheritance is a new class of embodiment , the new class is called the child class , called the class inherited superclass

Inherited properties: subclasses genetic properties and functions of the parent class

Second, why should inherit

• You can reduce redundant code

Third, inherited objects

• python class may inherit a plurality of parent classes

  class Parent1:
      pass
  
  
  class Parent2:
      pass
  
  
  class Son(Parent1, Parent2):
      pass

  print(Sub1.__bases__)
  -----------------------------------------
  #(<class '__main__.Parent1'>, <class '__main__.Parent2'>)

• In Python3 If a class does not inherit any class, the default object class inheritance

• If a class does not inherit any class in Python2, the object will not inherit the class

• print(Parent1.__bases__)
  (<class 'object'>,)

Fourth, the classification category

The new class

• Inherited class and subclass of the class of object, are the new class
• All classes are Python3 new class

Classic

• Not inherited class and subclass of the class of object, are Classic
• Only Python2 in the only Classic