Question

我已添加此功能，确保用户确实想要退出该程序。当你真的想要退出时它可以工作，但如果你想返回程序，它只是循环语句：

def WantToQuit():
    Quit = raw_input("Please enter y if you are sure you want to quit, if not press n to return ")
    if Quit == 'y':
        print ('')
    elif Quit == 'n':
        DisplayMenu()
        return WantToQuit()

其他地方：

elif Choice == 'q':
    WantToQuit()
    raw_input('Press enter key to continue ')

Answer 1

将print ('')替换为sys.exit (0)并删除return WantToQuit()。

我还建议您在.lower()变量上应用Quit，以便它不区分大小写。

Answer 2

如果没有更多的代码，很难向您展示自己的错误，但是我知道如何设置它：

def WantToQuit():
    Quit = raw_input("Please enter y if you are sure you want to quit, if not press n to return ")
    if Quit == 'y':
        print ('')
    elif Quit == 'n':
        DisplayMenu()
    return WantToQuit()

while(True):
    DisplayMenu()
    # Some logic to get input and handle it
    # For example, something like
    selection = raw_input("Please make a selection: ")
    if(selection == "1"):
        doSomething()
    elif(selection == "2"):
        doSomethingElse()
    elif(selection == "q"):
        WantToQuit()
    else:
        # TODO: Handle this !
        pass

我就是这样做的：

def WantToQuit():
    Quit = raw_input("Please enter y if you are sure you want to quit, if not press n to return ")
    if Quit == 'y':
        return true
    elif Quit == 'n':
        return false
    else:
        # TODO: Handle this !
        pass

while(True):
    DisplayMenu()
    # Some logic to get input and handle it
    # For example, something like
    selection = raw_input("Please make a selection: ").lower()
    if(selection == "1"):
        doSomething()
    elif(selection == "2"):
        doSomethingElse()
    elif(selection == "q"):
        if(WantToQuit()): break
    else:
        # TODO: Handle this !
        pass

或者，您可以执行以下操作：

def WantToQuit():
    Quit = raw_input("Please enter y if you are sure you want to quit, if not press n to return ")
    if Quit == 'y':
        sys.exit(0)
    elif Quit == 'n':
        return # Do nothing really
    else:
        # TODO: Handle this !
        pass

while(True):
    DisplayMenu()
    # Some logic to get input and handle it
    # For example, something like
    selection = raw_input("Please make a selection: ").lower()
    if(selection == "1"):
        doSomething()
    elif(selection == "2"):
        doSomethingElse()
    elif(selection == "q"):
        WantToQuit()
    else:
        # TODO: Handle this !
        pass

第一个示例使WantToQuit函数返回一个布尔值，无论用户实际是否想要退出。如果是这样，那么无限循环就会被打破，程序会自然退出。

第二个示例处理WantToQuit函数内部的退出，调用sys.exit()立即退出。

第一种可能更可取，尽管两者都在实践中使用。

Answer 3

您可以使用名为quit()的已定义函数，而不是创建新函数。 quit功能会弹出一个框，上面写着：

[In]

quit()

[OUT]

Your program is still running!
Do you want to kill it?
    Yes    No

Python 2.7退出

3 个答案: