Asynchronous Programming Sample code snippet

sample_async_programming.py

import asyncio
import time

global var

var=0

def expensive_process():
    return 1


async def some_async():
    print("some_async START")
    global var
    var = expensive_process()
    await asyncio.sleep(5)
    print("some_async COMPLETE")


async def some_function():
    print("some_function START")
    global var
    asyncio.create_task(some_async())
    try:

        async def message_check():
            global var
            if var==1:
                return
        await asyncio.wait_for(message_check(), timeout=3.0)
    except asyncio.TimeoutError:
        print('timeout!')
    print(var)
    print("some_function COMPLETE")



def main(name):

    print(f'Hi, {name}')
    asyncio.run(some_function())


    print(f'Hi, {name}')


if __name__ == '__main__':
    main('PyCharm')
    
    
 #Output
#some_async START is not completed but terminated once the check is met
/*
Hi, PyCharm
some_function START
some_async START
1
some_function COMPLETE
Hi, PyCharm
*/