how to update this countdown program and it's labels every second

[Niloofar24]

Hi friends!
I want to create a countdown program. Here is my code:

from kivy.app import App

from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label

import datetime

class CountdownApp(App):
    def build(self):

        delta = datetime.datetime(2015, 3, 21, 2, 15, 11) - datetime.datetime.now()
        days = delta.days
        days = str(days)
        self.label_days = Label(text=days + "  days")

        hour_string = str(delta).split(', ')[1]
        hours = hour_string.split(':')[0]
        self.label_hours = Label(text=hours + "  hours")

        minuts = hour_string.split(':')[1]
        self.label_minuts = Label(text=minuts + "  minuts")

        seconds = hour_string.split(':')[2]
        self.label_seconds = Label(text=seconds + "  seconds")



        b = BoxLayout(orientation="vertical")
        b.add_widget(self.label_days)
        b.add_widget(self.label_hours)
        b.add_widget(self.label_minuts)
        b.add_widget(self.label_seconds)
        return b

if __name__ == "__main__":
    CountdownApp().run()

I want the program to update itself every seconds and then the label wich shows seconds should be updated every seconds....
How can i do that?

[Slyte]

you could try to use kivy's Clock module

from kivy.clock import Clock

class CountdownApp(App):
    def build(self):
        t = 1.0 / 60.0 # 1/60th of a second, use 1.0 instead to update every second
        Clock.schedule_interval(self.update, t)

        # some other code ....

    def update(self, dt):
        # update things - your labels?

[Niloofar24]

@Slyte, what is that dt in line 10 for?

[Slyte]

I refer you to this Kivy Clock. :) I'm not really well versed with kivy. I do know dt means delta-time. :)

[Niloofar24]

Well, i stil have problem with this program, what should i type in line 11, for the update function?!

All my code that should be updated every seconds, are in the build function in the CountdownApp class.

[ms95]

the easiest way would be wraping the part you want in a while True loop and then putting a time.sleep(1) at the start of that loop or at the end of that so it will make a 1 second delay to update the loop , so your countdown .