class attribute with Inheritance

class AAA(object):
    x = 1


class BBB(AAA):
    pass


class CCC(AAA):
    pass


if __name__ == '__main__':
    # AAA: {'x': 1}, BBB: {}, CCC: {}
    print(AAA.x, BBB.x, CCC.x)
    BBB.x = 2
    # AAA: {'x': 1}, BBB: {'x': 2}, CCC: {}
    print(AAA.x, BBB.x, CCC.x)
    AAA.x = 3
    # AAA: {'x': 3}, BBB: {'x': 2}, CCC: {}
    print(AAA.x, BBB.x, CCC.x)