python中

# -*- coding: utf-8 -*-


class A(object):
    """
    a
    """
    def __init__(self):
        """
        init
        """
        self.param = 'a'
        self._param = '_a'
        self.__param = '__a'

    def __method(self):
        """
        :return:
        """
        print("a __method")

    def _method(self):
        """
        :return:
        """
        print("a _method")

    def method(self):
        """
        :return:
        """
        print('a method')
        self.__method()


class B(A):
    """
    b
    """
    def __method(self):
        """
        :return:
        """
        print("b __method")

    def _method(self):
        """
        :return:
        """
        print("b _method")

    def method(self):
        """
        :return:
        """
        print('b method')
        self.__method()
a = A()
a.method()
a._method()
a.__method()
b = B()
b.method()
b._method()
b.__method()
print(b.param)
print(b._param)
print(b.__param)