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Accepted
pegasus
Asked: 2024-12-01 18:08:59 +0800 CST

await asyncio.Task 和 asyncio.Task.result() 之间有什么区别？

  • 772

await asyncio.Task任务完成后，和有什么区别asyncio.Task.result()？

以下代码中唯一的区别是我如何读取中的值task。

import asyncio
from asyncio import TaskGroup

async def func():
    await asyncio.sleep(2)
    return 0

async def main():
    async with TaskGroup() as tg:
        task = tg.create_task(func())
        print(await task)

asyncio.run(main())

对比

import asyncio
from asyncio import TaskGroup

async def func():
    await asyncio.sleep(2)
    return 0

async def main():
    async with TaskGroup() as tg:
        task = tg.create_task(func())
    # The await is implicit when the context manager exits.
    print(task.result())

asyncio.run(main())

哪一个代码是首选？

python

1 个回答

  1. Best Answer

    下面的源代码片段显示，如果任务完成，await task最终会调用task.result()。所以答案是：在这种情况下没有区别。

        def __await__(self):
        if not self.done():
            self._asyncio_future_blocking = True
            yield self  # This tells Task to wait for completion.
        if not self.done():
            raise RuntimeError("await wasn't used with future")
        return self.result()  # May raise too.

# location: asyncio/futures.py, in class _Future,
# the Task class is derived from it
    • 1

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