func_code: def swap_unique_keys_values(a):
      new_dict = {v: k for k, v in list(a.items())}
      l = []
      for i in a:
          l.append(a[i])
      for i in l:
          if l.count(i) > 1:
              del new_dict[i]
              break
      return new_dict
      return new_dict