code: def _transcoding_dict(cls, data):
          
          if not isinstance(data, dict):
              raise ValueError('Parameter data must be dict object.')
  
          result = {}
          for k, v in data.items():
              k = cls._transcoding(k)
              if isinstance(v, dict):
                  v = cls._transcoding_dict(v)
              elif isinstance(v, list):
                  v = cls._transcoding_list(v)
              else:
                  v = cls._transcoding(v)
              result.update({k: v})
          return result
docs: 编码转换 for dict
          :param data: 需要转换的 dict 数据
          :return: 转换好的 dict