new_contents: from django.core.management.base import BaseCommand
  from geopy.geocoders import get_geocoder_for_service
  from geopy.exc import GeocoderQuotaExceeded
  
  from ballot.models import BallotReturned
  
  
  class Command(BaseCommand):
      help = 'Populates the latitude and longitude fields of BallotReturned'
  
      def populate_latitude_for_ballots(self):
          for b in BallotReturned.objects.filter(latitude=None).order_by('id'):
              full_ballot_address = '{}, {}, {} {}'.format(
                  b.normalized_line1, b.normalized_city, b.normalized_state, b.normalized_zip)
              location = self.google_client.geocode(full_ballot_address)
              if location is None:
                  raise Exception('Could not find a location for ballot {}'.format(b.id))
              b.latitude, b.longitude = location.latitude, location.longitude
              print('ballot {}, found latitude {}, longitude {}'.format(b.id, b.latitude, b.longitude))
              b.save()
  
      def handle(self, *args, **options):
          self.google_client = get_geocoder_for_service('google')()
  
          while BallotReturned.objects.filter(latitude=None).exists():
              try:
                  self.populate_latitude_for_ballots()
              except GeocoderQuotaExceeded:
                  self.google_client = get_geocoder_for_service('google')()
  
          print('Success! All BallotReturned objects now have latitude and longitude populated.')
  
subject: Add command for populating latitude and longitude