lesson04_submit_no_args.py

# SuperFastPython.com
# example issuing an asynchronous task with no arguments
from random import random
from time import sleep
from concurrent.futures import ThreadPoolExecutor

# custom function to be executed in a worker thread
def task():
 # generate a random value between 0 and 1
 value = random()
 # report a message
 print(f'Task generated {value}')
 # block for a moment to simulate work
 sleep(value)
 # return a new value
 return value

# protect the entry point
if __name__ == '__main__':
 # create the thread pool
 with ThreadPoolExecutor() as exe:
 # issue an asynchronous task
 future = exe.submit(task)
 # get the result once the task completes
 result = future.result()
 # report the result
 print(result)