lesson07_exception.py

# SuperFastPython.com
# example of a thread closing itself via an exception
from random import random
from time import sleep
from threading import Thread
import threading

# handle exceptions in new thread
def handler(args):
 print(f'Got: {args.exc_value}')

# custom function to be executed in a new thread
def task():
 # loop forever
 while True:
 # generate a random value between 0 and 1
 value = random()
 print(f'.{value}')
 # block
 sleep(value)
 # check if we should close the thread
 if value > 0.9:
 print('Closing thread')
 raise Exception('Stop now!')

# protect the entry point
if __name__ == '__main__':
 # register a handler for exception in a new thread
 threading.excepthook = handler
 # create and configure the new thread
 thread = Thread(target=task)
 # start the new thread
 thread.start()
 # wait for the thread to terminate
 thread.join()
 # main continues on
 print('Main continuing on...')