def switch_page_cb(self, ws, child):
        self.logger.debug(str(child) % "page switch: %s")
        bnch = self._find_tab(child)
        if bnch is not None:
            self.make_callback('page-switch', bnch.name, bnch.data)
        return False
dataset/ETHPy150Open ejeschke/ginga/ginga/gw/Desktop.py/Desktop.switch_page_cb/swapped operands of `%`