班级子类词典

Question

是否有办法让所有班级的继承词典？

喜欢的东西

class MagikClass : 

     pass 

class A(MagikClass) : 

     __name__ = "A" 

print magik_dict # -> { "A": A } 

Answer 1

这里是增加了一个属性_derived每个类，包含类的派生类的解决方案：

class Meta(type): 
    def __new__(cls, name, bases, dict_): 
     new_class = type.__new__(cls, name, bases, dict_) 
     new_class._derived = {} 
     if isinstance(bases[0], Meta): 
      bases[0]._derived[name] = new_class 
     return new_class 

class Magic(object): 
    __metaclass__ = Meta 

class A(Magic): 
    pass 

class B(Magic): 
    pass 

print Magic._derived 

打印

{'A': <class '__main__.A'>, 'B': <class '__main__.B'>}