[Python] Kivy: Using progress bar to simulate a process and then execute other code

I'm trying to use the progress bar in Kivy to simulate completion of an external process, at the end of which a function should run to provide some results.

I've looked at all the posts here discussing progress bar and Clock scheduled events. I've tried the methods, but I still can't get the effect I want.

Within my main widget class, I have the following methods defined:

def update_progbar(self):
print(self.progbar.value)
self.progbar.value += 10.0


def start_progbar_update(self):
print("start progbar update")
self.update_progbar_event = Clock.schedule_interval(lambda dt: self.update_progbar(),1)


def stop_progbar_update(self):
print("stop progbar update")
self.update_progbar_event.cancel()


def run_program(self):
if self.progbar.value < 100.0:
self.start_progbar_update()
elif self.progbar.value >= 100.0:
self.stop_progbar_update()

#wait for progress bar to fill up, then execute code below
results = some_function(args)


So, the effect is to display to the user a simulated process that takes some time, and then produces some results.

The starting of progress bar update is working. I see the progress bar widget fill up 10% every second. But after it gets to 100%, it keeps running and keeps printing "100.0" and never exits.

I can't seem to get the condition if progbar.value >= 100.0: stop_progbar_update() to work. The Clock schedule interval event never gets cancelled.

The code below it never gets a chance to run.

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