func_code: def swap_unique_keys_values(d):
      dictionary = {}
      counter = []
      new = []
      for k, v in list(d.items()):
          counter.append(v)
      for c in counter:
          if counter.count(c) == 1:
              new.append(c)
      for k, v in list(d.items()):
          if v in new:
              dictionary[v] = k
      return dictionary