import praw
bot = praw.Reddit(user_agent='Mazzochi Bot', client_id='XXX', client_secret='XXX', username='Mazzochi', password='XXX')
subreddit = bot.subreddit('all')
comments = subreddit.stream.comments()
while True:
    try:
        for comment in comments:
            text = comment.body
            if 'u/mazzochi' in text.lower():
                comment.reply('hello.')
    except:
        continue