while循环只运行一次

Question

正如标题所说，我的 while 循环只会运行一次。我第一次运行代码时，它要求输入，我可以回答历史和地理类别中的所有问题。然后我输入 exit 并再次尝试运行代码，它会一直问我想要什么主题。如果我输入exit它仍然会停止，但我无法做到运行所以我可以再次回答我的问题

while True:
        choose = input("What topic would you like?")
        if choose.lower() == "history":
            import History
            continue
        elif choose.lower() == "geo" or choose.lower() == "geography":
            import Geo
            continue
        elif choose.lower() == "i'm done" or choose.lower() == "exit":
            print("Thanks for playing!")
            break;
        else: 
            print("Sorry, please enter a valid topic")
            continue

Answer 1

无法再次导入 .py 文件。而是调用那些 .py 文件的函数。例如。如果 history.py 有一个名为 def questions() 的函数并且 geo 有一个同名的函数，你可以像这样修改你的代码

import History
import Geo

while True:
        choose = input("What topic would you like?")
        if choose.lower() == "history":
            History.questions()
            continue
        elif choose.lower() == "geo" or choose.lower() == "geography":
            Geo.questions()
            continue
        elif choose.lower() == "i'm done" or choose.lower() == "exit":
            print("Thanks for playing!")
            break
        else:
            print("Sorry, please enter a valid topic")
            continue

Answer 2

正如@tdelaney 在评论中建议的那样，无法再次导入模块。您可以做的是在 History 和 Geo 中编写一个函数，并在需要时调用它们。

试试这个：

对于History.py

def askQuestion():
    print('the Question')

在Geo.py

中做同样的事情

对于main.py

import History
import Geo  
while True:
    choose = input("What topic would you like?")
    if choose.lower() == "history":
        History.askQuestion()
        continue
    elif choose.lower() == "geo" or choose.lower() == "geography":
        Geo.askQuestion()
        continue
    elif choose.lower() == "i'm done" or choose.lower() == "exit":
        print("Thanks for playing!")
        break;
    else: 
        print("Sorry, please enter a valid topic")
        continue

Answer 3

输入退出后无法再次运行此代码。因为 break 关键字终止了在 exit 下定义的循环。

但是你可以使用一些技巧来继续退出代码。

    while True: 
     choose = input("What topic would you like?")
     if choose.lower() == "history":
        import History
        continue
     elif choose.lower() == "geo" or choose.lower() == "geography":
        import Geo
        continue
     elif choose.lower() == "i'm done" or choose.lower() == "exit":
        print("Thanks for playing!")
        play_again = input("Are want to play again(y/N)?")
        if play_again.lower()=='y':
            continue
        else:
            break
     else:
        print("Sorry, please enter a valid topic")
        continue

while循环只运行一次

While loop only runs one time

python

while-loop