Python 2.7退出

我已经添加了这个功能，确保用户真的想退出程序。它的工作原理，当你真正想戒烟，但如果你想返回到程序，它只是循环语句：Python 2.7退出

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()

在别处：

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

来源

2013-03-22 user1655562

是否有你'WantToQuit（）'函数来调用一个理由本身递归？ – 2013-03-22 10:26:41

你应该真的缩进你的代码，所以我们至少可以知道返回语句或第二个raw_input属于哪里 – 2013-03-22 10:26:47

我刚才意识到我调用了它两次，我应该返回什么函数？ – user1655562 2013-03-22 10:28:24

更换print ('')与sys.exit (0)与和删除return WantToQuit()。

我也建议你在你的Quit变量上应用.lower()，这样它就不区分大小写。

来源

2013-03-22 10:30:38 eandersson

很难向你展示你做错了没有更多的代码是什么，但在这里就是我的身影，你把它设置：

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

这是我会怎么做：

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，你可以这样做：

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

第一个例子有WantToQuit乐趣ction返回一个布尔值，无论用户实际上是想要退出。如果是这样，无限循环被破坏，程序自然退出。

第二个示例处理WantToQuit函数内的退出，并呼叫sys.exit()立即退出。

第一个可能是可取的，虽然两者都在实践中使用。

来源

2013-03-22 10:32:49 jedwards

您可以使用已定义的函数quit()来代替新功能。该quit功能会弹出一个对话框，上面写着：

[在]

quit()

[OUT]

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

来源

2016-07-11 17:18:30 Supercolbat

Python 2.7退出

回答

相关问题