func_code: def swap_unique_keys_values(dic):
      dic = {'a': 4, 'b': 7, 'c': 10, 'd': 7}
      list_of_values = [dic[value] for value in dic]
      unique_dict = {}
      for key in dic:
          if list_of_values.count(dic[key]) == 1:
              unique_dict[dic[key]] = key
      return unique_dict