import praw
import os

r = praw.Reddit(username='username', password='password', client_id='app_id', client_secret='app_secret', user_agent='comment notifier for cuddlefishcat')

if not os.path.isfile("commentsRead.txt"):
    commentsRead = []
else:
    with open("commentsRead.txt", "r") as f:
       commentsRead = f.read()
       commentsRead = commentsRead.split("\n")
       commentsRead = list(filter(None, commentsRead))

subreddits = ['subreddit1', 'subreddit2']

for subreddit in subreddits:
    for comment in r.subreddit(subreddit).comments(limit=10):
        if comment.id not in commentsRead:
            print 'sent comment ' + comment.permalink
            r.redditor('targetuser').message('New comment in ' + subreddit, ' here\'s the text:\n\n' + comment.body + '\n\n' + comment.permalink)
            commentsRead.append(comment.id)

with open("commentsRead.txt", "w") as f:
    for post_id in commentsRead:
        f.write(post_id + "\n")