import praw
import re

# User will need at least 2 karma to bypass captcha
uname = "" # EDIT WITH USERNAME
upass = "" #EDIT WITH PASSWORD
cache = []

r = praw.Reddit(user_agent = "null")
r.login(uname, upass, disable_warning = True)
print("[LOG] Logged in.")
subreddit = r.get_subreddit("all")

clearcache = 0
while True:
    clearcache += 1
    try:
        for submission in subreddit.get_new(limit = 10):
            print(submission.title)
            title = submission.title.lower()
            if submission.id not in cache and re.search(r"don'?t ?upvote", title):
                submission.downvote() # lol
                print("[LOG] Post downvoted :( ")
                cache.append(submission.id)
    except: # Assuming reddit goes down
        time.sleep(100)
        continue
	time.sleep(60)
    if clearcache > 100: # Hopefully will avoid cache becoming too full or bloated
        cache = []