test_state_button.py

from kivy.app import App
from kivy.clock import Clock
from kivy.uix.button import Button


class MyApp(App):
    def build(self):
        self.b = Button()
        self.b.bind(on_press=self.reset_button)
        return self.b

    def reset_button(self, *l):
        Clock.schedule_once(self._reset_button, 1)

    def _reset_button(self, *l):
        self.b.state = 'normal'

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