def login(self):
usr_input = self.ids.usr_input
psw_input = self.ids.psw_input
msg = Guest.login(usr_input.text, psw_input.text)
if msg:
MessagePopup(message=msg).open()
usr_input.focus = True
else:
usr_input.text = ''
psw_input.text = ''
root = App.get_running_app().root # main screen manager
root.transition = CardTransition(direction="up", mode="pop")
root.current = "menu"
