python - 如何将类作为参数传递并继承方法

Question

我已经读过 this但我想在参数中继承类的方法。

例子:

class TypeOfGame1(object):
    def get_max_players(self):
        return 2

class TypeOfGame2(object):
    def get_max_players(self):
        return 30

class Game(object):
    def __init__(self, game_cls):
        self.game = game_cls()

然后从上面的代码我怎么能做这样的事情:

a = Game(TypeOfGame1)
a.get_max_players()  # should return 2
a = Game(TypeOfGame2)
a.get_max_players()  # should return 30

Answer 1

如果我理解正确的话，使用 __getattr__ 来代理你的类怎么样？

n [2]: class Game(object):
   ...:     def __init__(self, game_cls):
   ...:         self.game = game_cls()
   ...:     def __getattr__(self, other):
   ...:         return getattr(self.game, other)
   ...:

In [7]: g = Game(TypeOfGame1)

In [8]: g.get_max_players()
Out[8]: 2

In [11]: g = Game(TypeOfGame2)

In [12]: g.get_max_players()
Out[12]: 30