new_contents: from pymongo import MongoClient
  
  
  def main():
      client = MongoClient()
      db = client.cityhotspots
      db.drop_collection('dineroptions')
      diners_collection = db.diners
  
      doc = {}
      diner_options_collection = db.dineroptions
      doc['categories'] = diners_collection.distinct('category')
      doc['cuisines'] = diners_collection.distinct('cuisine')
      doc['districts'] = diners_collection.distinct('district')
      diner_options_collection.insert(doc)
  
  
  if __name__ == '__main__':
      main()
  
subject: Add extract_options.py