询问有效答案时无法完成循环

Question

我的代码有问题，我也找不到解决方案。我问的问题必须是有效的，但循环只是继续，让我输入。

print('Do you want to go to the store or woods?')

lists = ('woods', 'store')
while True:
    answers = input()    
    if answers == 'store':
        break
        print('Going to the store...')
    elif answers == 'woods':
        break
        print('Going to the woods...')
    while lists not in answers:
        print('That is not a valid answer')

Answer 1

您想检查用户的答案是否不在您的有效答案列表中。你正在做的是相反的方式。试试这个：

if answers not in lists:
    print('That is not a valid answer')

此时您还需要 break，或者再次打印您的提示信息。

Answer 2

试试这个：

print('Do you want to go to the store or woods?')
places = ('woods', 'store')
while True:
    answer = input()
    if answer in places:
        print ("Going to the {0}...".format(answer))
        break
    else:
        print('That is not a valid answer')

Answer 3

首先，您的 print 语句无法访问。您可以找到更多信息 here.

#...
if answers == 'store':
        print('Going to the store...')
        break
    elif answers == 'woods':
        print('Going to the woods...')
        break
#...

那么，您的第二个 while 语句就这样没有意义了。如果您只是想打印 That is not a valid answer 以防输入不同于 store 或 woods 并再给用户一次尝试 - 那么您可以只使用 else，而不使用 lists 完全：

print('Do you want to go to the store or woods?')

# no lists
while True:
    answers = input()
    if answers == 'store':
        print('Going to the store...')
        break
    elif answers == 'woods':
        print('Going to the woods...')
        break
    else:
        print('That is not a valid answer')

如果您想检查是否在 lists 中遇到了用户的输入，那么您需要从里到外执行此 in 技巧：

print('Do you want to go to the store or woods?')

lists = ('woods', 'store')
while True:
    answers = input()
    if answers == 'store':
        print('Going to the store...')
        break
    elif answers == 'woods':
        print('Going to the woods...')
        break
    elif answers not in lists:
        print('That is not a valid answer')
    else:
        # some default case, for example sys.exit() (needs sys to be imported)

询问有效答案时无法完成循环

Can't finish the loop when asking for valid answers

python

adventure