Python Coroutines and Tasks 파이썬 코루틴과 태스크

파이썬에서 여러 작업을 코루틴으로 동시에 진행해 보자.

 

import asyncio
import time
 
async def show_text(text, delay):
    for i in range(5):
        print(text + " " + str(i))
        await asyncio.sleep(delay)
        # coroutine asyncio.sleep(delay, result=None)
        # Block for delay seconds. If result is provided,
        # it is returned to the caller when the coroutine
        # completes. sleep() always suspends the current
        # task, allowing other tasks to run.
    return text
 
async def main():
    #result = await asyncio.gather(
    #    show_text("first", 0.5),
    #    show_text("second", 0.5),
    #    show_text("third", 1)
    #    )
    #print(result)
 
    task1 = asyncio.create_task(show_text("first", 0.5))
    task2 = asyncio.create_task(show_text("second", 0.5))
    task3 = asyncio.create_task(show_text("third", 1))
    # The asyncio.create_task() function to run coroutines
    # concurrently as asyncio Tasks.
 
    await task1
    await task2
    await task3
    # Awaiting on a coroutine.
 
    print("result: " + task1.result())
    print("result: " + task2.result())
    print("result: " + task3.result())
    
if __name__ == "__main__":
    start = time.time()
    asyncio.run(main())
    # The asyncio.run() function to run the top-level
    # entry point “main()” function.
    end = time.time()
    print(end - start)

 

 

총 소요시간은 5초이다.

첫 번째, 두 번째, 세 번째 작업의 소요시간 총 합이 아닌, 가장 긴 작업 시간을 가진 세 번째 작업의 소요시간인 5초가 걸린다.

 

※ Coroutines and Tasks