確保用戶在其輸入中包含'@'符號

Question

我想驗證用戶在我的程序中輸入的數據（電子郵件地址）。如果用戶輸入'@'符號，程序應該接受它。如果沒有，程序應該循環並再次請求電子郵件。到目前爲止，我試圖做到這一點，但程序循環對於已經進入的每一個字符：

emailright = True 

while emailright == True:  
    email = input("Please enter your email address") 
    character = ("@") 
    for character in email: 
     if character == '@': 
      print("Your email address had been registered") 
      emailright = True 
     else: 
      print("invalid email address, please re-enter") 
      emailright = False 

while循環和裏面的一切也已經縮進。 謝謝！

Answer 1

雖然有很多更好的電子郵件驗證方法，這更簡潔實現你的邏輯：

email = input("Please enter your email address") 
while '@' not in email:  
    email = input("invalid email address, please re-enter") 
print("Your email address had been registered") 

Answer 2

while True:  
    email = input("Please enter your email address") 
    if '@' in email: 
     break 

或者：

https://pypi.python.org/pypi/validate_email

Answer 3

這樣的事情？

import re 


is_email_valid = None 


while is_email_valid is None: 
    email = input("Please enter your email address") 
    is_email_valid = re.match('^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$', email) 
    if is_email_valid: 
     print("Your email address had been registered") 
    else: 
     print("invalid email address, please re-enter") 

這是我從提取正則表達式網站：

http://emailregex.com/

電子郵件