docs: def hgetall(self, key):
          """
          Returns all fields and values of the has stored at `key`.
  
          The underlying redis `HGETALL`_ command returns an array of
          pairs.  This method converts that to a Python :class:`dict`.
          It will return an empty :class:`dict` when the key is not
          found.
  
          .. note::
  
             **Time complexity**: ``O(N)`` where ``N`` is the size
             of the hash.
  
          :param key: The key of the hash
          :type key: :class:`str`, :class:`bytes`
          :returns: a :class:`dict` of key to value mappings for all
              fields in the hash
  
          .. _HGETALL: http://redis.io/commands/hgetall
  
          """
  
          def format_response(value):
              return dict(zip(value[::2], value[1::2]))
  
          return self._execute(
              [b'HGETALL', key], format_callback=format_response)