RedditCommentRespond.py

  import os
  import praw
  
  reddit = praw.Reddit(
        username = os.environ.get('REDDIT_USERNAME'),
        password = os.environ.get('REDDIT_PASSWORD'),
	client_id = os.environ.get('API_CLIENT'),
	client_secret = os.environ.get('API_SECRET'),
	user_agent = "Scooby Searcher Bot"
  )

    for comment in reddit.subreddit('cartoons').comments(limit=1000):
        if "scooby dooby doo" in comment.body.lower():
          comment.reply("Where are you?")