Функция asyncio.wait() это еще один способ вызвать множество асинхронных задач.
Она работает в нескольких режимах.
1. Самый простой - ждем завершения всех задач
async def main():
tasks = [asyncio.create_task(do_it(i)) for i in range(10)]
done, pending = await asyncio.wait(
tasks,
return_when=asyncio.ALL_COMPLETED
)
for task in done:
try:
print(task.result())
except Exception as e:
print(e)
Очень похоже на gather, но работает не так.
▫️возвращает не результаты, а два сета с объектами Task у которых можно забрать результат через task.result() если они в списке done
▫️не гарантирует порядок результатов так как оба объекта это set
▫️не выбрасывает исключение когда оно появляется, а сохраняет его в Task. Исключение появится когда попробуете забрать резултьтат.
2. Ждем завершения первой задачи, даже если там ошибка.
async def main():
tasks = [asyncio.create_task(do_it(i)) for i in range(3)]
done, pending = await asyncio.wait(
tasks,
return_when=asyncio.FIRST_COMPLETED
)
# в done может быть несколько задач!
for task in done:
try:
print(task.result())
except Exception as e:
print(f"Fail: {e}")
# Оставшиеся задачи в pending, как правило, нужно отменить, иначе они будут продолжать работать
for task in pending:
task.cancel()
В сете done будут таски которые успели завершится, причем как успешно так и нет.
3. До первой ошибки.
Тоже самое, но с аргументом FIRST_EXCEPTION
done, pending = await asyncio.wait(
tasks,
return_when=asyncio.FIRST_EXCEPTION
)
Функция завершается как только первая задача упадет с ошибкой.
Учтите, что в любом случае done вы можете обранужить несколько задач, как с ошибками так и успешные.
↗️ Полный листинг примеров здесь
#async
Really Good One to Watch
The daughter takes a step forward with each question.
The father stands there. The daughter, who starts off playfully laughing.... is shocked to see her father standing there despite her progress.
When the father steps forward for the final question, she hugs him. Father - Daughter ❤️
Children can be raised without knowing hardship.
But it is important to make them know that nothing they get comes so easily ❤️
#Inspiring
@InspiringThoughts
Really Good One to Watch
The daughter takes a step forward with each question.
The father stands there. The daughter, who starts off playfully laughing.... is shocked to see her father standing there despite her progress.
When the father steps forward for the final question, she hugs him. Father - Daughter ❤️
Children can be raised without knowing hardship.
But it is important to make them know that nothing they get comes so easily ❤️
#Inspiring
@InspiringThoughts
Really Good One to Watch
The daughter takes a step forward with each question.
The father stands there. The daughter, who starts off playfully laughing.... is shocked to see her father standing there despite her progress.
When the father steps forward for the final question, she hugs him. Father - Daughter ❤️
Children can be raised without knowing hardship.
But it is important to make them know that nothing they get comes so easily ❤️
#Inspiring
@InspiringThoughts
Really Good One to Watch
The daughter takes a step forward with each question.
The father stands there. The daughter, who starts off playfully laughing.... is shocked to see her father standing there despite her progress.
When the father steps forward for the final question, she hugs him. Father - Daughter ❤️
Children can be raised without knowing hardship.
But it is important to make them know that nothing they get comes so easily ❤️
#Inspiring
@InspiringThoughts
Really Good One to Watch
The daughter takes a step forward with each question.
The father stands there. The daughter, who starts off playfully laughing.... is shocked to see her father standing there despite her progress.
When the father steps forward for the final question, she hugs him. Father - Daughter ❤️
Children can be raised without knowing hardship.
But it is important to make them know that nothing they get comes so easily ❤️
#Inspiring
@InspiringThoughts