Fixed?

import praw
import time
import collections
import re
import random

r = praw.Reddit("Irrelevant xkcd by /u/Eddonarth")

def login_():
    USERNAME = "User"
    PASSWORD = "Pass"
    r.login(USERNAME, PASSWORD)

done = collections.deque(maxlen=300)

try:
    login_()
    print("Login success! Getting comments now...")
except praw.errors.InvalidUserPass:
    print('Invalid User/Pass')


while True:
    comments = r.get_comments("all")
    print("Retrieved comments successfully.")
    for post in comments:
        if post.id not in done:
            done.append(post.id)
            print("Found posts, appending.")
            if "[relevant xkcd]".upper() in post.body.upper():
                random.seed()
                randomNo = random.randrange(1, 1314)
                #post.reply("[Irrelevant xkcd](http://xkcd.com/"+str(randomNo)+"/)")
                print('Got to end')
                time.sleep(2)
    time.sleep(10)