抽象工厂设计模式

 1 class Frog:
 2     def __init__(self,name):
 3         self.name = name
 4 
 5     def __str__(self):
 6         return self.name
 7 
 8     def interact_with(self,obstacle):
 9         print(‘{} the frog encounters {} and {}‘.format(self,obstacle,obstacle.action()))
10 
11 class Bug():
12     def __str__(self):
13         return ‘a bug‘
14 
15     def action(self):
16         return ‘eats it‘
17 
18 class FrogWorld():
19     def __init__(self,name):
20         print(self)
21         self.player_name = name
22 
23     def __str__(self):
24         return ‘\n\n\t--------- frog world ---------‘
25 
26     def make_character(self):
27         return Frog(self.player_name)
28 
29     def make_obstacle(self):
30         return Bug()
31 
32 class Wizard():
33     def __init__(self,name):
34         self.name = name
35     def __str__(self):
36         return self.name
37 
38     def interact_with(self,obstacle):
39         print(‘{} the Wizard battles against {} and {}!‘.format(self,obstacle,obstacle.action()))
40 
41 class Ork:
42     def __str__(self):
43         return ‘an evil ork‘
44     def action(self):
45         return ‘kill it‘
46 
47 class WizardWorld:
48     def __init__(self,name):
49         print(self)
50         self.player_name = name
51 
52     def __str__(self):
53         return ‘\n\n\t------- Wizard World -------‘
54 
55     def make_character(self):
56         return Wizard(self.player_name)
57 
58     def make_obstacle(self):
59         return Ork()
60 
61 class GameEnvironment:
62     def __init__(self,factory):
63         self.hero = factory.make_character()
64         self.obstacle = factory.make_obstacle()
65 
66     def paly(self):
67          self.hero.interact_with(self.obstacle)
68 
69 def validate_age(name):
70     try:
71         age = input(‘welcome {} .how old are you? ‘.format(name))
72         age = int(age)
73     except ValueError as err:
74         print(‘Age {} is invalid, please try again .....‘.format(age))
75         return (False,age)
76     return (True,age)
77 
78 def main():
79     name = input("hello,what‘your name?")
80     valid_input = False
81     while not valid_input:
82         valid_input, age = validate_age(name)
83     game = FrogWorld if age < 18 else WizardWorld
84     environment = GameEnvironment(game(name))
85     environment.paly()
86 
87 if __name__ == ‘__main__‘:
88     main()