# 测试类及类方法的继承
class A(object):
    def test1(self):
        print('testA1')
        self.__private_test_a3()
    def test2(self):
        print('testA2')
    # 私有方法，只能在该类里面被调用，不用在外面通过引用类然后掉用
    def __private_test_a3(self):
        print('testA3')
class B(A):
    def test3(self):
        print('testB3')
    def test1(self):
        print('testB1')
        self.test3()
a = A()
a.test1()
b = B()
b.test1()
b.test2()