Class variables: are services for the class, all instances of the class are shared, changed in one place, and all the values of the local variables of the call change. The class is defined as the class name. Variable name instance variable: In the instance, the value of each instance variable is modified according to the requirements of the instance itself, does not affect other instances, and the class is defined as self. The variable name (1) defines a class c:a = 0 #类变量 b = 0 #类变 Volume Def __init__ (self, flag): SELF.A = Flag #实例变量 C.A = 1 #类变量赋值 c.b = 1 #类变量赋值 (2) Class instantiation test1 = C (5) Test2 = C (6) (3) View results >>> test1.a5>>> test2.a6# instance variables have different values depending on the instance >>> c.a1> >> c.b1>>> test1.b1>>> test2.b1# class variables are the same in all instances >>> c.b = ten #改变类变量值 >>> test1. B10>>> test2.b10# can see that the class variables in all instances have changed
The difference between a Python class variable and an instance variable
