Created
July 20, 2020 04:41
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#: kivy 1.11.1 | |
<MainLayout@BoxLayout>: | |
palindrome_label: palindrome_label | |
prime_label: prime_label | |
prime: 100000000 | |
palindrome: 10000001 | |
orientation: 'vertical' | |
BoxLayout: | |
orientation: 'horizontal' | |
Label: | |
id: palindrome_label | |
text: 'The current palindrome is {}'.format(root.palindrome) | |
Label: | |
id: prime_label | |
text: 'The current prime is {}'.format(root.prime) | |
Splitter: | |
sizable_from: 'top' | |
BoxLayout: | |
orientation: 'horizontal' | |
Button: | |
text: 'Get next palindrome' | |
on_press: app.update_palindrome() | |
Button: | |
text: 'Get next prime' | |
on_press: app.update_prime() |
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from concurrent.futures import ThreadPoolExecutor | |
import kivy | |
from kivy.app import App | |
from kivy.properties import ObjectProperty, NumericProperty | |
from kivy.uix.boxlayout import BoxLayout | |
from kivy.clock import Clock | |
def is_prime(n): | |
''' | |
Checks if a number is prime. | |
''' | |
for i in range(2, n): | |
if n % i == 0: return False | |
return True | |
def get_next_prime(n): | |
''' | |
Returns the next prime number larger than n. | |
''' | |
n += 1 | |
while not is_prime(n): n += 1 | |
return n | |
def get_next_palindrome(n): | |
''' | |
Returns the next palindromic number larger than n. | |
''' | |
n += 1 | |
while not str(n) == str(n)[::-1]: n += 1 | |
return n | |
class MainLayout(BoxLayout): | |
palindrome_label = ObjectProperty(None) | |
prime_label = ObjectProperty(None) | |
palindrome = NumericProperty(1) | |
prime = NumericProperty(1) | |
class AsyncApp(App): | |
def __init__(self, *args, **kwargs): | |
super().__init__(*args, **kwargs) | |
self._executor = ThreadPoolExecutor(max_workers=1) | |
self._future = None | |
self._clock_event = None | |
def build(self): | |
self.layout = MainLayout() | |
return self.layout | |
def update_palindrome(self): | |
current = self.layout.palindrome | |
self.layout.palindrome = get_next_palindrome(current) | |
def update_prime(self): | |
if self._future is None or self._future.done(): | |
print("Starting a new thread, current prime is {}".format(self.layout.prime)) | |
self._future = self._executor.submit(get_next_prime, self.layout.prime) | |
self._clock_event = Clock.schedule_interval(self.check_thread_status, 0.1) | |
def check_thread_status(self, *args): | |
if not self._future.done(): | |
return | |
else: | |
maybe_e = self._future.exception() | |
if maybe_e is not None: | |
raise maybe_e | |
else: | |
next_prime = self._future.result() | |
self.layout.prime = next_prime | |
Clock.unschedule(self._clock_event) | |
if __name__ == '__main__': | |
AsyncApp().run() |
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