#!/usr/bin/env python
# -*- coding: utf-8 -*-

class Base(object):
    def __init__(self):
        self.name = "Base"

    def echo(self):
        self.hello()
        print("name = {}".format(self.name))
        self._underscore1_func()
        self.__underscore2_func()

    def hello(self):
        print("My class is Base.")

    def _underscore1_func(self):
        print("Base::_underscore1_func()")

    def __underscore2_func(self):
        print("Base::__underscore2_func()")

class Deriv(Base):
    def __init__(self):
        super().__init__()
        self.name = "Deriv"

    def hello(self):
        print("My class is Deriv.")

    def _underscore1_func(self):
        print("Deriv::_underscore1_func()")

    def __underscore2_func2(self):
        print("Deriv::__underscore2_func()")


if __name__ == '__main__':
    print(">>>> Base object")
    a = Base()
    a.echo()
    print()

    print(">>>> Deriv object")
    b = Deriv()
    b.echo()

>>>> Base object
My class is Base.
name = Base
Base::_underscore1_func()
Base::__underscore2_func()

>>>> Deriv object
My class is Deriv.
name = Deriv
Deriv::_underscore1_func()
Base::__underscore2_func()

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