func_code: def swap_unique_keys_values(d):
      new_dict = {}
      values = []
      keys = []
      for z, q in list(d.items()):
          keys.append(q)
          values.append(z)
      for z, q in list(d.items()):
          if not keys.count(q) > 1:
              new_dict[q] = z
      return new_dict