import praw

reddit = praw.Reddit(client_id='',
                     client_secret='',
                     password='',
                     user_agent='',
                     username='')

readingfrom = reddit.submission('3ywu0b')  # Last year's thread.
body = author = []
readingfrom.comments.replace_more(None)
postingto = reddit.submission('5l9x4k')  # Today's follow-up thread.
for comment in readingfrom.comments:
    if comment.body == '[deleted]':  # There could be more conditionals for common comment-overwriting scripts
        continue
    elif comment.author is None:
        continue
    body.append(comment.body)
    author.append(comment.author.name)
commentcount = str(len(body))
print 'I found ' + commentcount + ' comments to reply to.'
for x in range(0, len(body)):  # if the bot barfs, it'll print the last comment completed to the console, replace 0 with the next one to process
    body[x] = body[x].replace('\n', '\n> ')  # Quote the user correctly with each line-break.
    try:
        postingto.reply('/u/' + author[x] + '\n\nExactly one year ago, I asked what you wanted to achieve by 31st Dec 2016 and I said I would message you to see if you achieved it. Well, today is the day!\n\nYour goal was:\n\n> ' + body[x])
    except (TypeError, UnicodeEncodeError):  # I'm not actually sure this is needed or was a relic of testing.
        postingto.reply('/u/' + author[x] + '\n\nExactly one year ago, I asked what you wanted to achieve by 31st Dec 2016 and I said I would message you to see if you achieved it. Well, today is the day!\n\nYour goal was:\n\n> ' + body[x].encode('utf8'))
    print str(x) + '/' + commentcount