Question

在Person对象中，已经有了对广告资源的支持，以及Person时的支持对象将获取Weapon对象或Food对象，该对象将转到清单。对于我们的Tribute对象，我们希望有一种方法可以从中检索Weapon和Food对象库存。在Tribute类get weapons()中创建一个新方法，该方法将返回一个 Weapon当前在其广告资源中有Tribute个对象的元组

class Tribute(Person):


    def get_weapon(self):
        for item in self.get_inventory():
            if isinstance(item, self.RangedWeapon):
                return tuple(item)
            else:
                pass

    cc = Tribute("Chee Chin", 100)
    chicken = Food("chicken", 5)
    aloe_vera = Medicine("aloe vera", 2, 5)
    bow = RangedWeapon("bow", 4, 10)
    sword = Weapon("sword", 2, 5)

    Base = Place("base")
    Base.add_object(cc)
    Base.add_object(chicken)
    Base.add_object(aloe_vera)
    Base.add_object(bow)
    Base.add_object(sword)

    cc.take(bow)                           # Chee Chin took bow
    cc.take(sword)                         # Chee Chin took sword
    cc.take(chicken)                       # Chee Chin took chicken
    cc.take(aloe_vera)                     # Chee Chin took aloe_vera



    def add_object(self, new_object):
        if isinstance(new_object, Thing) or isinstance(new_object, LivingThing):
            self.objects.append(new_object)
            new_object.place = self
        else:
            GAME_LOGGER.warning("You can only add Thing or LivingThing to {}".format(self.get_name()))

    def named_col(col):
        # Only accepts tuple/list
        type_col = type(col)
        if type_col != list and type_col != tuple:
            return None

        return type_col(map(lambda x: x.get_name() if isinstance(x, NamedObject) else x, col))

当我尝试print(named_col(cc.get_weapons()))时收到错误

AttributeError: 'RangedWeapon' object has no attribute 'owner'


class Thing(MobileObject):
    def __init__(self, name):
        super().__init__(name, None)
        self.owner = None 

    def set_owner(self, owner):
        self.owner = owner

    def get_owner(self):
        return self.owner

    def is_owned(self):
        return self.owner is not None

RangedWeapon之前已在此类class RangedWeapon(Weapon):

下定义

Answer 1

下面：

if isinstance(item, self.RangedWeapon):
    return tuple(item)

你没有返回所有武器的元组，你将一个武器从命名元组转换为常规元组并返回单个对象。这剥离了命名属性，因此错误。相反，你需要像：

def get_weapon(self):
    weapons = []
    for item in self.get_inventory():
        if isinstance(item, RangedWeapon):
            weapons.append(item)
    return tuple(weapons)

您还应该完全将get_weapon（cc = Tribute("Chee Chin", 100)之后）之外的所有代码移到课堂外，即将所有代码全部移除。

Answer 2

尝试：

def get_weapons(self):
   weapons = []
   for item in self.get_inventory():
     if isinstance(item, RangedWeapon):
        weapons.append(item)
     elif isinstance(item, Weapon):
        weapons.append(item)
   return tuple(weapons)

返回一个对象元组

2 个答案: