python 函数私有方法

#coding:utf-8

class A(object):
    def _test1(self):
        print('this is _test1')
    def test2(self):
        print('this is test2')
    def __test3(self):
        print('__test3')

class B(A):
    def run(self):
        self._test1()
        self.test2()
        self._A__test3()

b = B()
a = A()
a._A__test3()
b.run()

　　结果

__test3
this is _test1
this is test2
__test3