Short function for sending messages using a Gmail account.

gmail.py

def gmail(recipients, subject, message, sender_username, sender_password):
  import smtplib
  server = smtplib.SMTP('smtp.gmail.com', 587)
  server.ehlo()
  server.starttls()
  server.ehlo()
  server.login(username, password)
 
  if not (isinstance(recipients, list) or isinstance(recipients, tuple)):
    recipients = [recipients]
 
  gmail_sender = '{0}@gmail.com'.format(username)
  message_formatstr = 'To: {0}\nFrom: {1}\nSubject: {2}\n\n{3}\n\n'
 
  for recipient in recipients:
    server.sendmail(gmail_sender,
                    recipient,
                    message_formatstr.format(recipient, gmail_sender, subject, message))
  
  server.quit()