lesson02_task_callback.py

# SuperFastPython.com
# example of adding a done callback function to a task
import asyncio

# custom done callback function
def handle(task):
 print(f'Task callback done: {task.done()}')

# 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())
 # add a done callback function
 task.add_done_callback(handle)
 # wait for the task to complete
 await task

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