code: def set_input_by_id(self, _id, value):
          
  
          xpath = './/*[@id="%s"]' % _id
          if self._lxml_form is None:
              self.choose_form_by_element(xpath)
          sel = XpathSelector(self.form)
          elem = sel.select(xpath).node()
          # pylint: disable=no-member
          return self.set_input(elem.get('name'), value)
docs: Set the value of form element by its `id` attribute.
  
          :param _id: id of element
          :param value: value which should be set to element