Game Sample

class GAME():
    def __init__(self, input_handler, output_handler):
        self.input = input_handler
        self.output = output_handler

    def run(self):
        # start
        mode = self.get_mode()
        self.output.display('chosen mode is: %s' % mode)
        # the rest....
        return 0

    def get_mode(self):
        self.output.display('Please select a game mode:\n\
                            [1] Human vs Human\n\
                            [2] Human vs PC\n\
                            [3] PC vs PC')
        chosen = self.input.query('your option is: ')
        return chosen

class INPUT():
    def __init__(self):
        pass
    def query(self, query):
        return input(query)

class OUTPUT():
    def __init__(self):
        pass
    def display(self, content):
        print content

class CHARACTER():
    def __init__(self, game, **kwargs):
        self.game = game
        self.name = kwargs.pop('name')
        self.life = kwargs.pop('life')
        self.attacks = kwargs.pop('attacks')

    def get_attack(self, chosen_attack):
        return self.attacks[chosen_attack]

    def display_attacks(self, filter_name):
        for k, v in self.attacks.items():
            if filter_name in k:
                self.game.output.display('%s: %s' % k, v.description)
class ATTACK():
    def __init__(self, name, damage, description):
        self.name = name
        self.damage = damage
        self.description = description

class PUNCH(ATTACK):
    def __init__(self):
        ATTACK.__init__(self, 'punch', 10, 'punches for 10 damage')

import sys

def main(*args, **kwargs):
    i = INPUT()
    o = OUTPUT()
    return GAME(i, o)

m = main(sys.argv)
sys.exit(m.run())