code: def values_append(self, range, params, body):
          
          url = SPREADSHEET_VALUES_APPEND_URL % (self.id, quote(range))
          r = self.client.request('post', url, params=params, json=body)
          return r.json()
docs: Lower-level method that directly calls `spreadsheets.values.append <https://developers.google.com/sheets/api/reference/rest/v4/spreadsheets.values/append>`_.
  
          :param str range: The `A1 notation <https://developers.google.com/sheets/api/guides/concepts#a1_notation>`_
                            of a range to search for a logical table of data. Values will be appended after the last row of the table.
          :param dict params: `Query parameters <https://developers.google.com/sheets/api/reference/rest/v4/spreadsheets.values/append#query-parameters>`_.
          :param dict body: `Request body <https://developers.google.com/sheets/api/reference/rest/v4/spreadsheets.values/append#request-body>`_.
          :returns: `Response body <https://developers.google.com/sheets/api/reference/rest/v4/spreadsheets.values/append#response-body>`_.
          :rtype: dict
  
          .. versionadded:: 3.0