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This article introduces the relevant knowledge of "what is the difference and function of class methods, class instance methods, and static methods in Python development". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

The difference and function of class method, class instance method and static method in Python development: class method is the method of class object; class instance method is the method of class instantiation object; state method is an arbitrary function, decorated with "@ staticmethod" above it.

Class method: a method of a class object, which needs to be decorated with "@ classmethod" at the top of the definition. The formal parameter is cls, which indicates that the class object, class object and instance object can all be called.

Class instance method: it is the method that the class instantiates the object. Only the instance object can be called. The formal parameter is self, which refers to the object itself.

Static method: it is an arbitrary function that is decorated with "@ staticmethod" and can be called directly with an object. Static methods don't really have much to do with this class.

All three methods are defined in the class. Let me first briefly talk about how to define and invoke it, in which the instance object has the greatest permissions.

Instance method definition: the first parameter must be an instance object, and the parameter name is generally defined as "self". Through it, the properties and methods of the instance can also be passed.

Call: can only be called by an instance object.

Class method definition: use the decorator @ classmethod. The first parameter must be the current class object, and the parameter name is generally specified as "cls", through which you can pass the properties and methods of the class (not the properties and methods of the instance).

Invocation: both instance objects and class objects can be called.

Static method definition: use the decorator @ staticmethod. The parameters are arbitrary, there are no "self" and "cls" parameters, but any properties and methods of the class or instance cannot be used in the method body

Invocation: both instance objects and class objects can be called.

Instance methods in short, instance methods are methods that can be used by instances of a class. There is not too much explanation here.

Class methods use the decorator @ classmethod.

In principle, a class method is a method that operates on the class itself as an object. Assuming that there is a method that is logically called with the class itself as an object, then this method can be defined as a class method. In addition, if inheritance is required, it can also be defined as a class method.

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