Python instance-determined properties and methods or class binding methods

Binding properties and methods to an instance object:
1. Bind attributes to an instance: first define a student class

#!/usr/bin/pythonclass Student(object):    pass

Then bind the properties:

s = Student()s.name = ‘AAA‘ # 动态给实例绑定一个属性print(s.name)#输出AAA

2, to the instance binding method: First define a method

def add(self,a,b):    self.a = a    self.b = b    return self.a +self.b

Then bind the method:

When Methodtype binds a method to a class instance, each instance has its own point-of-reference area, which does not interfere with each other. Methodtype (method name, instance object)

from types import MethodTypes.add = MethodType(add,s)print(s.add(10,20))#输出30print(s.a)#输出10print(s.b)#输出20

Second, to the class binding method:
Using Methodtype to bind a method to a class is not to write the method directly inside the class, but rather to create a link to an external method in memory, and this link will be copied when the instance is created.
Methodtype (method name, class name)

Student.add = MethodType(add,Student)s2 = Student()print(s2.add(10,60))#输出70

#也可以把函数直接赋给类. xxx

Student.add = adds3 = Student()print(s3.add(10,60))#输出70

Python instance-determined properties and methods or class binding methods