lesson02_cancel_task.py

# SuperFastPython.com
# example of canceling an asyncio task
import asyncio

# define a coroutine for a task
async def task_coroutine():
 # report a message
 print('executing the task')
 # suspend for a moment
 await asyncio.sleep(1)

# custom coroutine
async def main():
 # report a message
 print('main coroutine')
 # create and schedule the task
 task = asyncio.create_task(task_coroutine())
 # wait a moment
 await asyncio.sleep(0.5)
 # cancel the task
 was_cancelled = task.cancel()
 print(f'>was canceled: {was_cancelled}')
 # wait a moment
 await asyncio.sleep(0.1)
 # report the status
 print(f'>canceled: {task.cancelled()}')

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