小编Rya*_* WE的帖子

为什么接口不能实现这样的方法？

public interface ITargetableUnit {
        //Returns whether the object of a class that implements this interface is targetable
     bool unitCanBeTargeted(){
        bool targetable = false;
        if(this is Insect){
            targetable = (this as Insect).isFasterThanLight();
        }
        else if(this is FighterJet){
            targetable = !(this as FighterJet).Flying;
        }
        else if(this is Zombie){
            targetable = !(this as Zombie).Invisible;
        }
        return targetable;
    }
}

Insect和Zombie都已经从基类Creature派生而来,而FighterJet派生自类Machine但是,并非所有的Creature都是可定位的,并且不使用ITargetableUnit inteface.

是否有任何解决方法可以解决我所面临的问题？

我的Python程序使用字典，并且有大量的“if”语句只是为了检查检索到的值的类型。

我想避免这种情况，而是以更编程正确的方式进行。

这是一个例子：

# golddb should only contain str keys and int values
golddb = dict()

def gainGold(playername):
  global golddb
  golddb[playername] += 1  # error may happen if I try to += a non-int type
  golddb[playername] = "hello"  # I want python to give an error when I try to assign a str to be a value in the dict