Effects of modification of python class attributes in inheritance

1  class A(object):
 2      x = 1
 3  
4  class B(A):
 5      pass 
6  
7  class C(A):
 8      pass 
9  
10  #Modify the class attributes through the parent class, and the class attributes inherited by the subclass also change 
11 Ax = 3
 12  print (Ax, Bx, Cx)
 13  #Modifying the class attributes inherited from the parent class by subclasses will only change the class attributes inherited by the subclass 
14 Bx = 2
 15  print (Ax, Bx, Cx)
 16  #The subclass first modifies the inherited class attributes, and then the parent class modifies the class attributes, and will not make changes to the modified subclass attributes 
17 Bx = 4
 18 Ax = 1
 19  print(A.x, B.x, C.x)