Sidebar 'top 3' table

#!/usr/bin/python3
import praw
import sys
import html.parser
from datetime import datetime as time
import OAuth2Util


def main():
    subr = "Everton"
    start = '[](/start)'
    end = '[](/end)'
    ua = 'Sidebar updater for /r/Everton'
    top = []
    tbl_top = '|Top recent discussions|[](/comm "No. of comments")\n:-:|:-:\n'
    tbl_row = '|[{0}]({1})|[{2}]({3})\n'
    content = start + '\n\n'

    # login
    r = praw.Reddit(user_agent=ua)
    o = OAuth2Util.OAuth2Util(r)
    o.refresh()
    target_sub = r.get_subreddit(subr)

    # get top 30 posts from 'new'
    listing = r.get_subreddit(subr).get_new(limit=30)
    for post in listing:
        top.append(post)

    # sort submission objects by number of comments (most first)
    top.sort(key=lambda x: x.num_comments, reverse=True)
    listing = []

    for i in range(3):
        top[i].title = top[i].title.replace('|', '|')
        top[i].url = top[i].url.replace('|', '|')
        listing.append([top[i].title,
                        top[i].url,
                        top[i].num_comments,
                        top[i].short_link])
        print(top[i].title)
        print(top[i].url)

    # build markdown table and populate with post info
    content += tbl_top

    for i in listing:
        content += tbl_row.format(i[0], i[1], i[2], i[3])

    print(content)
    print(time.now().strftime('%Y-%m-%d %H:%M:%S'))

    desc = target_sub.get_settings()['description']
    desc = html.parser.HTMLParser().unescape(desc)
    before = desc.split(start)
    after = desc.split(end)

    new_desc = before[0] + content + end + after[1]
    target_sub.update_settings(description=new_desc)
    sys.exit()

if __name__ == '__main__':
    main()