python类变量和实例变量区别

 Generally speaking, instance variables are for data unique to each instance and class variables are for attributes and methods shared by all instances of the class:

class A:    aa=10    def __init__(self,a,b):        self.a=a        self.b=ba=A(5,20)print(a.a)  #实例变量print((a.aa))#实例读取类变量#打印结果 510