AttributeError:'str'对象没有属性

Question

我对python编程很陌生,我想尝试一个简单的文本冒险游戏,但我立即偶然发现了一个障碍.

class userInterface:
    def __init__(self, roomID, roomDesc, dirDesc, itemDesc):
        self.roomID = roomID
        self.roomDesc = roomDesc
        self.dirDesc = dirDesc
        self.itemDesc = itemDesc

    def displayRoom(self): #Displays the room description
        print(self.roomDesc)

    def displayDir(self): #Displays available directions
        L1 = self.dirDesc.keys()
        L2 = ""
        for i in L1:
                L2 += str(i) + " "
        print("You can go: " + L2)

    def displayItems(self): #Displays any items of interest
        print("Interesting items: " + str(self.itemDesc))

    def displayAll(self, num): #Displays all of the above
        num.displayRoom()
        num.displayDir()
        num.displayItems()

    def playerMovement(self): #Allows the player to change rooms based on the cardinal directions
        if input( "--> " ) in self.dirDesc.keys():
            letsago = "ID" + str(self.dirDesc.values())
            self.displayAll(letsago)
        else:
            print("Sorry, you can't go there mate.")



ID1 = userInterface(1, "This is a very small and empty room.", {"N": 2}, "There is nothing here.")

ID2 = userInterface(2, "This is another room.", {"W": 3}, ["knife", "butter"])

ID3 = userInterface(3, "This is the third room. GET OVER HERE", {}, ["rocket launcher"])

ID1.displayAll(ID1)
ID1.playerMovement()

那是我的代码,由于某种原因抛出了这个错误:

Traceback (most recent call last):
  File "D:/Python34/Text Adventure/framework.py", line 42, in <module>
    ID1.playerMovement()
  File "D:/Python34/Text Adventure/framework.py", line 30, in playerMovement
    self.displayAll(fuckthis)
  File "D:/Python34/Text Adventure/framework.py", line 23, in displayAll
    num.displayRoom()
AttributeError: 'str' object has no attribute 'displayRoom'

我在互联网和python文档中搜索到我在这里做错了什么,我不知道.如果我将ID2或ID3替换为self.displayAll(letsago),它可以完美地运行,但是由于玩家无法控制他想去的地方,所以这是没有意义的,所以我猜测尝试连接ID有什么问题使用字典中的数字,但我不知道该怎么做以及如何解决这个问题.

Answer 1

问题出在你的playerMovement方法上。你正在创建你的房间变量的字符串名称（ID1，ID2，ID3）：

letsago = "ID" + str(self.dirDesc.values())

但是，您创建的只是一个str。它不是变量。另外，我不认为它在做您认为在做的事情：

>>>str({'a':1}.values())
'dict_values([1])'

如果您确实需要以这种方式查找变量，则可以使用以下eval函数：

>>>foo = 'Hello World!'
>>>eval('foo')
'Hello World!'

或globals功能：

class Foo(object):
    def __init__(self):
        super(Foo, self).__init__()
    def test(self, name):
        print(globals()[name])

foo = Foo()
bar = 'Hello World!'
foo.text('bar')

但是，我强烈建议您重新考虑上课。您的userInterface课程本质上是Room。它不应该处理玩家的动作。这应该在另一个类之内，也许GameManager是这样。