Restarting Kivy GUI only after closing window

I tried to make the kivy window only restart after that i exit the window but i still can't find a way , any ideas ?

import sys

import kivy, os
from kivy.app import App
from kivy.uix.label import Label
from kivy.clock import Clock


class MyApp(App):
    def build(self):
        Clock.schedule_once(self.restart, 10)
        return Label(text='Hello World One!')

    def restart(self, dt):
        os.execv(sys.executable, [sys.executable] + sys.argv)


if __name__ == '__main__':
    MyApp().run()