lesson03_wait_for.py

# SuperFastPython.com
# example of waiting for a coroutine with a timeout
from random import random
import asyncio

# coroutine to execute in a new task
async def task_coro():
 # generate a random value between 0 and 1
 value = 1 + random()
 # report message
 print(f'>task got {value}')
 # suspend for a moment
 await asyncio.sleep(value)
 # report all done
 print('>task done')

# main coroutine
async def main():
 # create a task
 task = task_coro()
 # execute and wait for the task without a timeout
 try:
 await asyncio.wait_for(task, timeout=0.2)
 except asyncio.TimeoutError:
 print('Gave up waiting, task canceled')

# start the asyncio program
asyncio.run(main())