[1.8.x] Fixed #25455 -- Optimized dictfetchall() example.

    def dictfetchall(cursor):

        "Return all rows from a cursor as a dict"

        desc = cursor.description

        columns = [col[0] for col in cursor.description]

        return [

            dict(zip([col[0] for col in desc], row))

            dict(zip(columns, row))

            for row in cursor.fetchall()

        ]