flip_tweet_lang.py

#!/usr/bin/env python
import sys, pymongo

db = pymongo.Connection("localhost", 27017).tweets.tweets

for tweet_id in sys.stdin:
    tweet = db.find({'id':long(tweet_id)}).__getitem__(0)
    current_lang = tweet['user']['lang']
    new_lang = 'not_en' if (current_lang == 'en') else 'en'
    print "setting tweet", tweet['id'], "lang from", current_lang, "to", new_lang
    if not 'original_lang' in tweet['user']:
        tweet['user']['original_lang'] = current_lang
    tweet['user']['lang'] = new_lang
    db.save(tweet)