当我尝试使用gmail和python发送邮件时出现此类型的问题，但此问题对我没有帮助

gmail_user = "me@gmail.com"
gmail_pwd = "password"
TO = 'friend@gmail.com'
SUBJECT = "Testing sending using gmail"
TEXT = "Testing sending mail using gmail servers"
server = smtplib.SMTP('smtp.gmail.com', 587)
server.ehlo()
server.starttls()
server.login(gmail_user, gmail_pwd)
BODY = '\r\n'.join(['To: %s' % TO,
        'From: %s' % gmail_user,
        'Subject: %s' % SUBJECT,
        '', TEXT])

server.sendmail(gmail_user, [TO], BODY)
print ('email sent')

错误：

    server.login(gmail_user, gmail_pwd)
    File "/usr/lib/python3.4/smtplib.py", line 639, in login
   raise SMTPAuthenticationError(code, resp)
   smtplib.SMTPAuthenticationError: (534, b'5.7.14   
   <https://accounts.google.com/ContinueSignIn?sarp=1&scc=1&plt=AKgnsbtl1\n5.7.14       Li2yir27TqbRfvc02CzPqZoCqope_OQbulDzFqL-msIfsxObCTQ7TpWnbxIoAaQoPuL9ge\n5.7.14 BUgbiOqhTEPqJfb02d_L6rrdduHSxv26s_Ztg_JYYavkrqgs85IT1xZYwtbWIRE8OIvQKf\n5.7.14 xxtT7ENlZTS0Xyqnc1u4_MOrBVW8pgyNyeEgKKnKNyxce76JrsdnE1JgSQzr3pr47bL-kC\n5.7.14 XifnWXg> Please log in via your web browser and then try again.\n5.7.14 Learn more at\n5.7.14 https://support.google.com/mail/bin/answer.py?answer=78754 fl15sm17237099pdb.92 - gsmtp')