old_contents: import json
  
  with open('user_review_dictionary.json') as json_data:
      d = json.load(json_data)
  
  mongo_biguser =[]
  
  for user in d.keys():
        if len(d[user]) > 100:
          mongo_biguser.append(user)
  
  users= {"user_ids": mongo_biguser }
  
new_contents: import json
  
  with open('user_review_dictionary.json') as json_data:
      d = json.load(json_data)
  
  mongo_biguser =[]
  
  for user in d.keys():
        if len(d[user]) > 100:
          mongo_biguser.append(user)
  
  users= {"user_ids": mongo_biguser }
  
  with open('users_many_reviews_dictionary.json', 'w') as outfile:
      json.dump(users, outfile)
  
subject: Update users_many_reviews.py