Python 3.7 字典给出错误的值作为输出

Question

我正在用 Python 创建一个基于文本的游戏(我知道，这是一个非常常见的初学者项目)，我在嵌套字典中遇到了一个问题。这是字典代码:

gamemap = {
    "a1": {
        ZONENAME : "Town Market",
        DESCRIPTION : "This is the area where most goods are bought and sold",
        EXAMINATION : "There are 3 people in this area. You can talk to them.",
        SOLVED : False,
        UP : "",
        DOWN : "b1",
        LEFT : "",
        RIGHT : "a2",
        KEY : "pizzeria"

        },
    "a2": {
        ZONENAME : "Town Entrance",
        DESCRIPTION : "description",
        EXAMINATION : "examine",
        SOLVED : False,
        UP : "",
        DOWN : "b2",
        LEFT : "a1",
        RIGHT : "a3"
        },
    "a3": {
        ZONENAME : "Town Square",
        DESCRIPTION : "description",
        EXAMINATION : "examine",
        SOLVED : False,
        UP : "",
        DOWN : "b3",
        LEFT : "a2",
        RIGHT : "a4"
        },
    "a4": {
        ZONENAME : "Town Hall",
        DESCRIPTION : "description",
        EXAMINATION : "examine",
        SOLVED : False,
        UP : "",
        DOWN : "b4",
        LEFT : "a3",
        RIGHT : ""
        },
    "b1": {
        ZONENAME : "School",
        DESCRIPTION : "description",
        EXAMINATION : "examine",
        SOLVED : False,
        UP : "a1",
        DOWN : "c1",
        LEFT : "",
        RIGHT : "b2"
        },
    "b2": {
        ZONENAME : "Home",
        DESCRIPTION : "This is where you live. It is your home.",
        EXAMINATION : "Your house is a bright pink colour. I'm not judging you, but... ok I'm judging you. I'm sorry.",
        SOLVED : False,
        UP : "a2",
        DOWN : "c2",
        LEFT : "b1",
        RIGHT : "b3"
        },
    "b3": {
        ZONENAME : "",
        DESCRIPTION : "",
        EXAMINATION : "",
        SOLVED : False,
        UP : "a3",
        DOWN : "c3",
        LEFT : "b2",
        RIGHT : "b4"
        },
    "b4": {
        ZONENAME : "",
        DESCRIPTION : "description",
        EXAMINATION : "examine",
        SOLVED : False,
        UP : "a4",
        DOWN : "c4",
        LEFT : "b3",
        RIGHT : ""
        },
    "c1": {
        ZONENAME : "",
        DESCRIPTION : "description",
        EXAMINATION : "examine",
        SOLVED : False,
        UP : "b1",
        DOWN : "d1",
        LEFT : "",
        RIGHT : "c2"
        },
    "c2": {
        ZONENAME : "",
        DESCRIPTION : "description",
        EXAMINATION : "examine",
        SOLVED : False,
        UP : "b2",
        DOWN : "d2",
        LEFT : "c1",
        RIGHT : "c3"
        },
    "c3": {
        ZONENAME : "",
        DESCRIPTION : "description",
        EXAMINATION : "examine",
        SOLVED : False,
        UP : "b3",
        DOWN : "d3",
        LEFT : "c2",
        RIGHT : "c4"
        },
    "c4": {
        ZONENAME : "",
        DESCRIPTION : "description",
        EXAMINATION : "examine",
        SOLVED : False,
        UP : "b4",
        DOWN : "d4",
        LEFT : "c3",
        RIGHT : ""
        },
    "d1": {
        ZONENAME : "",
        DESCRIPTION : "description",
        EXAMINATION : "examine",
        SOLVED : False,
        UP : "c1",
        DOWN : "",
        LEFT : "",
        RIGHT : "d2"
        },
    "d2": {
        ZONENAME : "",
        DESCRIPTION : "description",
        EXAMINATION : "examine",
        SOLVED : False,
        UP : "c2",
        DOWN : "",
        LEFT : "d1",
        RIGHT : "d3"
        },
    "d3": {
        ZONENAME : "",
        DESCRIPTION : "description",
        EXAMINATION : "examine",
        SOLVED : False,
        UP : "c3",
        DOWN : "",
        LEFT : "d2",
        RIGHT : "d4"
        },
    "d4": {
        ZONENAME : "",
        DESCRIPTION : "description",
        EXAMINATION : "examine",
        SOLVED : False,
        UP : "c4",
        DOWN : "",
        LEFT : "d3",
        RIGHT : ""
        }

}

看起来不错，对吧？看看这个:

def print_location():
    current_place = "You are in the " + gamemap[myPlayer.location][ZONENAME]
    for character in current_place:
        sys.stdout.write(character)
        sys.stdout.flush()
        time.sleep(0.03)

正如你所看到的，这个函数告诉玩家他们在哪里，打印 ZONENAME 变量。这对他们中的大多数人都有效。例如，如果我转到a2，它会打印“You are in the Town Entrance”。

但是，如果我转到 a1，即使该函数中的代码相同，它也不会打印:“You are in the Town Market”(这是该区域的 ZONENAME)，而是打印“You are in比萨店”。 “pizzeria”是a1的KEY值，而不是zonename。

奇怪的是，如果我注释掉或删除 key ，它会打印正确的内容:“你在城镇市场”。

我尝试在其他嵌套字典上添加 KEY 值，但问题仍然存在。一旦我添加该变量，它就会打印该变量。这很令人困惑。我也尝试过更改 KEY 的名称，但也不起作用。

请帮忙解决这个问题。如果您需要查看更多脚本，我可以提供。提前致谢。

Answer 1

我相信您的问题在于您的词典定义。为了节省空间，我简化了您的示例。

ZONENAME="ZONENAME"
KEY="ZONENAME"
# ...
gamemap = {
  "a1": {
    ZONENAME : "Town Market",
    KEY : "pizzeria"
    },
  "a2": {
    ZONENAME : "Town Entrance",
    },
}

对于 ZONENAME、LEFT 等，您使用变量名称而不是字符串文字。现在这些可能是在您的程序中的某个地方定义的，因此程序仍然可以正常运行，但它具有误导性。我愿意打赌变量 KEY 在字典定义之前的某个位置被定义为“ZONENAME”。

程序中的实际情况是:

gamemap = {
  "a1": {
    "ZONENAME" : "Town Market",
    "ZONENAME" : "pizzeria" #  Overwrites Town Market key
    },
  "a2": {
    "ZONENAME" : "Town Entrance",
    },
}

将变量名称用单引号或双引号引起来，我相信您会从该函数中获得预期的行为，但这可能会破坏程序中的其他内容。

gamemap = {
  "a1": {
    "ZONENAME" : "Town Market",
    "KEY" : "pizzeria"
    },
  "a2": {
    "ZONENAME" : "Town Entrance",
    },
  # ...
}
def print_location():
    current_place = "You are in the " + gamemap[playerLocation][ZONENAME]
    print(current_place)

现在当我们运行时

playerLocation = "a1"
ZONENAME = "ZONENAME"
print_location()
# prints: You are in the Town Market

ZONENAME = "KEY"
print_location()
# prints: You are in the Pizzaria

请参阅此链接自行运行代码:https://repl.it/repls/MajesticMeanAutosketch