Reddit Contest Bot Script

import praw
import random

#Basic PRAW Auth
ua = '/u/someone for /r/somesub'
r = praw.Reddit(user_agent=ua)

#Reddit user which the bot logs into
user = input('Enter your reddit username ')
password = input('Enter your reddit password ')

r.login(user, password)

#Thread Identification reddit.com/r/subreddit/comments/SUBMISSIONIDHERE/tile_of_thread/
subid = input('Enter the Submission ID ')

#Pulls users from thread
thread = r.get_submission(submission_id=subid)
thread.replace_more_comments(limit=None, threshold=0)
flat_list = praw.helpers.flatten_tree(thread.comments)

authors = []

#Prints usernames into a csv
with open('thread.csv', 'w') as f:
    for thing in flat_list:
        #Prevents duplicate usernames from being saved to csv
        if thing.author is not None and thing.author.name not in authors:
            authors.append(thing.author.name)
            f.write(thing.author.name)
            f.write('\n')

#Reads the thread.csv file and randomly selects a line
lines = open('thread.csv').read().splitlines()
#Outputs the random line into a var
myline = random.choice(lines)

#Reads the myline var and prints it as a txt file
with open('winner.txt', 'w') as f:
    f.write(myline)
    f.write('\n')

#Creates the content of the message to send to the winning user
input('Now we are going form the message to the winning user')
subj = input('Enter the subject of the message')
cont = input('Enter the content of the message')
input('You may have to enter a captcha')

#Sends the content to winning user
r.send_message(myline, subj, cont)