code: def previous_page(self, max_=None):
          
  
          result = type(self)()
          result.before = Before(self.first.value)
          result.max_ = max_
          return result
docs: Return a query set which requests the page before this response.
  
          :param max_: Maximum number of items to return.
          :type max_: :class:`int` or :data:`None`
          :rtype: :class:`ResultSetMetadata`
          :return: A new request set up to request the previous page.
  
          Must be called on a result set which has :attr:`first` set.