python - Python NameError:未为文本游戏定义名称“north”

我为基于文本的游戏编写了此代码，但收到错误消息

 line 1, in <module>
userInput = input("Please enter a direction in which to travel: ")
 File "<string>", line 1, in <module>
NameError: name 'north' is not defined

这是我的代码

userInput = input("Please enter a direction in which to travel: ")
Map = {
    'north':'that way leads to the kitchen',
    'south':'that way leads to the dining room',
    'east':'that way leads to the entry',
    'west':'that way leads to the living room'
}
if userInput == north:
    print Map['north']
elif userInput == south:
    print Map['south']
elif userInput == east:
    print Map['east']
elif userInput == West:
    print Map['west']
elif userInput == '':
    print "Please specify a various direction."
else:
    quit

谢谢你的帮助

最佳答案

这条线

if userInput == north:
    ...

正在询问名为userInput的变量是否与变量north相同。

但是您尚未定义名为north的变量。该行应与字符串'north'这样比较。

if userInput == 'north':
    ...

但是，您可以像这样在字典键中测试用户输入。我已将您的常数更改为全部上限。

MAP = {
    'north':'that way leads to the kitchen',
    'south':'that way leads to the dining room',
    'east':'that way leads to the entry',
    'west':'that way leads to the living room'
}
userInput = raw_input("Please enter a direction in which to travel: ")
if userInput in MAP.keys():
    print MAP[userInput]

另外，如另一个答案中所述，raw_input比输入更安全。

一种替代方法是捕获这样的KeyError。

MAP = {
    'north':'that way leads to the kitchen',
    'south':'that way leads to the dining room',
    'east':'that way leads to the entry',
    'west':'that way leads to the living room'
}
userInput = raw_input("Please enter a direction in which to travel: ")
try:
    print MAP[userInput]
except KeyError:
    print 'What?'

或重复直到提供了这样的有效输入（并使其不区分大小写）：

MAP = {
    'north':'that way leads to the kitchen',
    'south':'that way leads to the dining room',
    'east':'that way leads to the entry',
    'west':'that way leads to the living room'
}
while True:
    userInput = raw_input("Please enter a direction in which to travel: ").lower()
    try:
        print MAP[userInput]
        break
    except KeyError:
        print '%s is not an option' % userInput

关于python - Python NameError:未为文本游戏定义名称“north”，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/19040012/