在Python中自定义验证

我试图实现自定义验证......我的目标是，如果用户的回复不是“Y”，或不是“N”，或不是“Q”，他们循环回到顶部。否则打破。
在Python中自定义验证

我试过的两个选项都会继续循环，即使给出了正确的响应。

这是我已经试过：选项1：

""" Use custom validation. """ 
while True: 
    n_put = input('Would you like to perform a new Google image search?' + user_options()) 
    if n_put is not "Y" or not "N" or not "Q": 
     print('Invalid response. Please read the prompt carefully. ') 
    else: 
     break

选项2：

""" Use custom validation. """ 
while True: 
    n_put = input('Would you like to perform a new Google image search?' + user_options()) 
    if n_put is not any(["Y", "N", "Q"]): 
     print('Invalid response. Please read the prompt carefully. ') 
    else: 
     break

来源

2017-10-14 N.Thompson

'如果不是n_put in ['Y'，'N'，'Q']：'或'如果不是n_put =='Y'而不是n_put =='N'' ... – cwallenpoole

可能重复[请求用户输入，直到他们给出有效的响应为止（https://stackoverflow.com/questions/23294658/asking-the-user-for-input-until-they-give-a-valid-response） – wwii

@wwii ，我的问题涉及多个非条件。没有太多的循环。 –

正确选项1：

while True: 
    n_put = input('Would you like to perform a new Google image search?' + user_options()) 
    if not (n_put == "Y" or n_put == "N" or n_put == "Q"): 
     print('Invalid response. Please read the prompt carefully. ') 
    else: 
     break

，正确选项2：

while True: 
    n_put = input('Would you like to perform a new Google image search?' + user_options()) 
    if n_put not in ["Y", "N", "Q"]: 
     print('Invalid response. Please read the prompt carefully. ') 
    else: 
     break

来源

2017-10-14 01:19:27 SatanDmytro

在Python中自定义验证

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