comment_reply_stream.py

import praw

CMT_PHRASE = "some phrase"
PARENT_PHRASE = "another phrase"

r = praw.Reddit(...)

cmt_stream = r.subreddit("pics").stream.comments(skip_existing=True)

def check phrase(cmt, parent):
    c = CMT_PHRASE in cmt.body.lower()
    p = PARENT_PHRASE in parent.body.lower()
    return c and p:

def parse_cmt(cmt):
    if cmt.parent_id[:3] == "t1_": # only proceed if the parent is a comment
        if check_phrase(cmt, parent):
            cmt.reply("Something to reply with here")

for cmt in cmt_stream:
    parse_cmt(cmt)