Uses PRAW to fetch a user's comment and write to a file.

RedditCommentFetcher

import praw
from datetime import datetime

utc_now = datetime.utcnow()

def main():
  username = raw_input('Username: ')
	password = raw_input('Password: ')
	limit = raw_input('Fetch limit: ')
	limit = int(limit)
	
	r = praw.Reddit(user_agent='Comment fetcher for /u/' + username)
	r.login(username, password)
	user = r.get_redditor(username)
	
	count = 0
	f = open('Comment.txt', 'w')
	for comment in user.get_comments(sort='new'):
		f.write('Date: {0}\nLink: {1}\nScore: {2}\nPost: {3}'.format(format_date(comment.created_utc), comment.permalink, comment.score, comment.body))
		f.write('\n-------------------------------\n')
		count += 1
		print 'Comment #' + str(count)
		if count == limit:
			break
	f.close()
	
	print 'Done'

def format_date(date):
	return datetime.fromtimestamp(date).strftime('%m/%d/%Y @ %I:%M:%S %p')

main()