pyhton gmail tar.gz mail monster

I have designed gmail tar.gz mail monster script in order to automatize sending relatively massive amount of file transfer over gmail. This script is born in the need of my photograph sessions, which produces hundreds of .jpeg files that need to be transferred to some mail accounts. From now on, I simply compress image files with tar.gz and put all of them in a directory. Inside that newly created directory, I run the following script.     create a directory that includes tar.gz files that will be transferred     put the python file inside that directory     create a file named 'account.conf', and populate it with your sender account username and password in separate lines as follows:          username      password          run the script, all tar.gz files inside that directory will be posted to the mail address that you provide in the beginning of the execution. #!/usr/bin/env python # -*- coding: utf-8 -*- from datetime import datetime import smtplib import random import string from email.MIMEText import MIMEText from email.Header import Header from email.Utils import parseaddr, formataddr from email.MIMEMultipart import MIMEMultipart from email.MIMEBase import MIMEBase from email.Utils import COMMASPACE, formatdate from email import Encoders import sys,os import re import gzip import shlex #assume gmail file limit is 20 MB GMAIL_FILE_LIMIT = 20000000L  session = None msg = None def send_files(recipient='',files=[]):     global session     global msg     print "Logging in gmail..."     session = smtplib.SMTP('smtp.gmail.com',587)     session.ehlo()     session.starttls()     session.ehlo()     session.login(username,password)     print "Logged in to the gmail_smtp."     sendList = []     mailTempBuffer = 0L     msg = None     msg = initializeMsg(msg)     for filename in files:           if not isFileValid(filename):             print str(filename) + " seems MORE than 20 mb , FAIL TO SEND, over capacity, file skipped..."             continue         if GMAIL_FILE_LIMIT > mailTempBuffer+os.path.getsize(filename):             mailTempBuffer = mailTempBuffer + os.path.getsize(filename)             sendList.append(filename)             continue         else:             send_mail(sendList)             mailTempBuffer = 0L             sendList = []             msg = None             msg = initializeMsg(msg)             mailTempBuffer = mailTempBuffer + os.path.getsize(filename)             sendList.append(filename)     if sendList:         send_mail(sendList)     session.quit()     print "Logged out from gmail" def send_mail(sendList):     global session     global msg     informationMessage = "Following files are in process...\n"     for mailItem in sendList:         informationMessage = informationMessage + "[" + str(mailItem) + "]" + "\n"     print informationMessage      for mailItem in sendList:         appendAttachment(mailItem)     print "mail is sending..."     session.sendmail(username,[recipient],msg.as_string())      def initializeMsg(msg):     msg = MIMEMultipart()     msg['From'] = username     msg['To'] = recipient     msg['Subject'] = message     msg['Date'] = formatdate(localtime=True)     msg.attach(MIMEText(message))     return msg      def appendAttachment(mailItem):     global session     global msg     filePtr = open(mailItem,"rb")     part = MIMEBase('application', "octet-stream")     part.set_payload( filePtr.read() )     Encoders.encode_base64(part)     part.add_header('Content-Disposition', 'attachment; filename="%s"' % mailItem)     print "[" + mailItem + "]" +  " is attaching..."     msg.attach(part)     filePtr.close()     print "[" + mailItem + "]" +  " is attached." def getFiles():     allFiles = os.listdir(".")     allTarFiles = []     for tars in allFiles:         if 'tar.gz' in tars:             allTarFiles.append(tars)     return allTarFiles def isFileValid(filename):     if os.path.getsize(filename) < GMAIL_FILE_LIMIT:         return True     return False f=open("account.conf","r") username = f.readline() password = f.readline() f.close() username = username.rstrip('\n') password = password.rstrip('\n') if len(sys.argv) < 2:     print "USAGE: python send-files-over-mail.py <destination@gmail.com> <message>"     sys.exit(1) files = getFiles() message = sys.argv[len(sys.argv)-1] recipient = sys.argv[1]  send_files(recipient,files)