Static member variables, instance member variables, static methods, class methods, instance methods for Python

Static member variables (class variables) and normal member variables (instance variables)

Static member variables can only be obtained through the class name. Variable name, instance member variable, referenced by the instance. Variable name obtained.

When an instance assigns a value to a static member variable, the instance

Python is a dynamically typed language with no special flags distinguishing between static member variables and ordinary member variables

If you use the class name. Member variable that member variable is now a static member variable (class variable)

If you use an instance. member variable that member variable is now a normal member variable (instance variable)

Static methods, class methods, instance methods

An instance method, a normal method in a class, called by an instance

Class methods, methods that are decorated by @classmethod, class objects, and instances can call class methods

Static methods, methods that are decorated by @staticmethod, class objects and instances can call static methods, and static methods do not affect any instances

The difference between an instance method and a class method is that the first argument to the instance method is self (the instance itself), and the first parameter of the class method is the CLS (Class object province)

Note: The class object and the instance object here mean the type (class name)---classobj
Type (instance name)-instance

Static member variables, instance member variables, static methods, class methods, instance methods for Python