func_code: def swap_unique_keys_values(my_dict):
      new = {}
      seen = []
      unseen = []
      for k, v in list(my_dict.items()):
          if v in unseen:
              seen.append(v)
          else:
              unseen.append(v)
      for k in my_dict:
          if my_dict[k] not in seen and unseen:
              new[my_dict[k]] = k
      return new