python类属性在继承中的修改的影响

 1 class A(object):
 2     x = 1
 3 
 4 class B(A):
 5     pass
 6 
 7 class C(A):
 8     pass
 9 
10 # 通过父类修改类属性,子类继承的类属性也改变
11 A.x = 3
12 print(A.x, B.x, C.x)
13 # 通过子类修改继承自父类的类属性,只会改变该子类继承的类属性
14 B.x = 2
15 print(A.x, B.x, C.x)
16 # 子类先修改继承的类属性,父类再修改类属性,将不会再对已经修改过的子类类属性做出改变
17 B.x = 4
18 A.x = 1
19 print(A.x, B.x, C.x)