code: def track_locations(locations):
      
      if len(locations) % 4 != 0:
          raise Exception('length of bounding box list should be a multiple of four')
      results = twapi.request('statuses/filter', {'locations': ','.join('%f' % l for l in locations)})
      return results.get_iterator()
docs: Return an iterator tweets from users in these locations.
      See https://dev.twitter.com/streaming/overview/request-parameters#locations
      Params:
          locations...list of bounding box locations of the form:
          southwest_longitude, southwest_latitude, northeast_longitude, northeast_latitude, ...