SMTPAuthenticationError when sending mail using gmail and python

when i try to send mail using gmail and python error occurred this type of question are already in this site but doesn't help to me

    gmail_user = "[email protected]"
    gmail_pwd = "password"
    TO = '[email protected]'
    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')

error:

        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')

Your code looks correct. Try logging in through your browser and if you are able to access your account come back and try your code again. Just make sure that you have typed your username and password correct

EDIT : Google blocks sign-in attempts from apps which do not use modern security standards (mentioned on their support page). You can however, turn on/off this safety feature by going to the link below:

Go to this link and select Turn On
https://www.google.com/settings/security/lesssecureapps

From: stackoverflow.com/q/26852128