code: def zscan(self, key, cursor=0, match=None, count=None):
          args = []
          if match is not None:
              args += [b'MATCH', match]
          if count is not None:
              args += [b'COUNT', count]
          fut = self.execute(b'ZSCAN', key, cursor, *args)
          def _converter(obj):
              return (int(obj[0]), pairs_int_or_float(obj[1]))
          return wait_convert(fut, _converter)