【C601035】以下的代码的输出将是什么? 说出你的答案并解释

class Parent(object):

    x = 1

class Child1(Parent):

    pass

class Child2(Parent):

    pass

print Parent.x, Child1.x, Child2.x

Child1.x = 2print Parent.x, Child1.x, Child2.x

Parent.x = 3print Parent.x, Child1.x, Child2.x