Track Twitter followers/unfollowers and receive difference by email

followers.py

#!/usr/bin/python3
# coding=utf-8

########################################################################
# AUTHOR	: Jean-Francois GAZET
# WEB 		: http://www.jeffprod.com
# TWITTER	: @JeffProd
# MAIL		: jeffgazet@gmail.com
# LICENCE	: GNU GENERAL PUBLIC LICENSE Version 2, June 1991
########################################################################

import difflib
import tweepy
import os.path
import smtplib

########################################################################
# CONF
########################################################################

# local file to record followers
FOLLOWERS_FILE = '/home/user/followers.txt'

# send changes by mail
EMAIL_TO = 'x@gmail.com'
EMAIL_FROM = 'x@gmail.com'

# gmail app paswd, see https://support.google.com/accounts/answer/185833
GMAIL_PSWD = 'xyxyxyxyxy'

# twitter API keys, see https://apps.twitter.com
consumer_key = ''
consumer_secret = ''
access_token = ''
access_token_secret = ''

# verbose
VERBOSE = False


########################################################################
# FUNCTIONS
########################################################################

# function to put a file into a string
def file_get_contents(fic):
    with open(fic, 'r') as myfile:
        return myfile.read()


# function to put a string into a file
def file_put_contents(filename, s):
    f = open(filename, 'w')
    f.write(s)
    f.close()


def sendgmail(frm, to, subject, msg):
    msgmail = "From: " + frm + "\n" + \
              "To: " + to + "\n" + \
              "Subject: " + subject + "\n\n" + \
              msg
    server = smtplib.SMTP('smtp.gmail.com', 587)
    server.starttls()
    server.login(frm, GMAIL_PSWD)
    server.sendmail(frm, to, msgmail)
    server.quit()
    log('email sent')


def log(msg):
    if not VERBOSE:
        return
    print(msg)


########################################################################
# PROGRAM
########################################################################

# Auth Twitter API
auth = tweepy.OAuthHandler(consumer_key, consumer_secret)
auth.set_access_token(access_token, access_token_secret)
api = tweepy.API(auth)

# get current followers
c_followers = []
try:
    log('getting current followers')
    for user in tweepy.Cursor(api.followers).items():
        c_followers.append(user.screen_name)
except tweepy.error.RateLimitError:
    log('Rate limit exceeded')
    exit(0)
c_followers.sort()
c_followers = "\n".join(c_followers)
        
# get previous followers from file
p_followers = ''
if os.path.isfile(FOLLOWERS_FILE):
    log('getting previous followers')
    p_followers = file_get_contents(FOLLOWERS_FILE)
else:  # very first call, save followers list
    log('followers file does not exists. writing it. exit')
    file_put_contents(FOLLOWERS_FILE, c_followers)
    exit(0)

# checking diff
result = ''
diff = difflib.ndiff(p_followers.splitlines(), c_followers.splitlines())
changes = [l for l in diff if l.startswith('+ ') or l.startswith('- ')]
for c in changes:
    result += c + "\n"

# saving current followers to file
log('writing current followers to file')
file_put_contents(FOLLOWERS_FILE, c_followers)

# if lists are differents : send email
if result != '':
    subject = 'Twitter followers status'
    msg = "Followers changes :\n\n" + \
          result + "\n" \
          "Current followers : " + str(c_followers.count("\n"))
    sendgmail(EMAIL_FROM, EMAIL_TO, subject, msg)