abstract_methods.py

#!/usr/bin/env python
#
# abstract_methods.py - example code on how to write an abstract methods.
#                       (lifted from http://norvig.com/python-iaq.html)
#
# Copyright (C) 2014 Michael Davies <michael@the-davies.net>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
# Or try here: http://www.fsf.org/copyleft/gpl.html
#

import inspect


def abstract():
    caller = inspect.getouterframes(inspect.currentframe())[1][3]
    raise NotImplementedError(caller + ' must be implemented in subclass')


class MyAbstractClass:
    def my_method(self):
        abstract()


class MyClass(MyAbstractClass):
    pass


if __name__ == '__main__':
    m = MyClass()
    m.my_method()