Reddit to Slack

import json
import requests
import pickle
import praw
from time import sleep

#  http://praw.readthedocs.io/en/latest/getting_started/authentication.html
reddit = praw.Reddit(client_id='your app client id',
                     client_secret='your app client secret',
                     username='your bot reddit username',
                     password='your bot reddit password',
                     user_agent='python3:KeyWordNotify:v1 (/u/Arkaon)')

webhook_url = 'https://hooks.slack.com/services/T00000000/B00000000/XXXXXXXXXXXXXXXXXXXXXXXX'

# this is the account that will receive the messages
you = reddit.redditor('your reddit username')
# scan comments in this subreddit
subreddit = reddit.subreddit('your subreddit name')

keywords = ['keyword1', 'keyword2', 'keyword3']  # case insensitive
ignore_users = ['baduser1', 'baduser2', 'baduser3']  # case SENSITIVE

# a list of submission ids that you have already been notified for
already_alerted_submissions = []

comment_stream = subreddit.stream.comments()


# a list of submission ids that you have already been notified for
already_alerted_submissions = []

comment_stream = subreddit.stream.comments()

def get_list_from_pickle(filename):
    try:
        with open(filename, 'rb') as fp:
            return pickle.load(fp)
    except:
        with open(filename, 'wb') as fp:
            pickle.dump([], fp)
        return []

def main():

    alerted_comments = get_list_from_pickle('alerted_comments.pickle')

    try:

        for comment in comment_stream:
            if comment.id in alerted_comments:
                continue

            if comment.author:  # if comment author hasn't deleted
                if comment.author.name in ignore_users:
                    continue

            for kw in keywords:
                if kw.lower() in comment.body.lower():  # case insensitive check
                    alerted_comments.append(comment.id)

                    while len(alerted_comments) > 100:
                        del alerted_comments[0]

                    with open('alerted_comments.pickle', 'wb') as fp:
                        pickle.dump(alerted_comments, fp)

            for kw in keywords:
                if kw.lower() in comment.body.lower():  # case insensitive check
                    already_alerted_submissions.append(comment.submission.id)
                    msg = '[Keyword *{0}* detected](http://www.reddit.com{1})'.format(
                        kw, comment.permalink)
                    slack_data = {'text': msg, 'mrkdwn': True}

                    response = requests.post('https://hooks.slack.com/services/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',
                                             data=json.dumps(slack_data), headers={'Content-Type': 'application/json'})
                    if response.status_code != 200:
                        raise ValueError('Request to slack returned an error %s, the response is:\n%s' % (
                            response.status_code, response.text))

    except Exception as e:
        print('There was an error: ' + str(e))
        sleep(60)  # wait for 60 seconds before restarting
        main()

if __name__ == '__main__':
    main()