在Python中自定義驗證

我試圖實現自定義驗證......我的目標是，如果用戶的回覆不是「Y」，或不是「N」，或不是「Q」，他們循環回到頂部。否則打破。
在Python中自定義驗證

我試過的兩個選項都會繼續循環，即使給出了正確的響應。

這是我已經試過：選項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

選項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

來源

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

可能重複[請求用戶輸入，直到他們給出有效的響應爲止（https://stackoverflow.com/questions/23294658/asking-the-user-for-input-until-they-give-a-valid-response） – wwii

@wwii ，我的問題涉及多個非條件。沒有太多的循環。 –

正確選項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

，正確選項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

來源

2017-10-14 01:19:27 SatanDmytro

在Python中自定義驗證

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