import csv
import tweepy

# get credentials at developer.twitter.com
auth = tweepy.OAuthHandler('API Key', 'API Secret')
auth.set_access_token('Access Token', 'Access Token Secret')

api = tweepy.API(auth)

# update these for whatever tweet you want to process replies to
name = 'patrick_oshag'
tweet_id = '1101551802930077696'

replies=[]
for tweet in tweepy.Cursor(api.search,q='to:'+name,result_type='recent',timeout=999999).items(1000):
    if hasattr(tweet, 'in_reply_to_status_id_str'):
        if (tweet.in_reply_to_status_id_str==tweet_id):
            replies.append(tweet)

with open('replies_clean.csv', 'wb') as f:
    csv_writer = csv.DictWriter(f, fieldnames=('user', 'text'))
    csv_writer.writeheader()
    for tweet in replies:
        row = {'user': tweet.user.screen_name, 'text': tweet.text.encode('ascii', 'ignore').replace('\n', ' ')}
        csv_writer.writerow(row)