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Python 并发与 asyncio 2.8 访问和手动管理事件循环

  • 2026-01-29 21:21:53
Python 并发与 asyncio 2.8 访问和手动管理事件循环

2.8 访问和手动管理事件循环

到目前为止,我们一直使用方便的 asyncio.run 来运行我们的应用程序并为我们后台创建事件循环。由于其易用性,这是创建事件循环的首选方法。然而,有时我们可能不想要 asyncio.run 提供的功能。例如,我们可能想执行自定义逻辑来停止任务,这与 asyncio.run 的行为不同,比如让任何剩余的任务完成,而不是停止它们。

此外,我们可能希望访问事件循环本身可用的方法。这些方法通常是低级别的,因此应谨慎使用。然而,如果你需要执行任务,比如直接处理套接字或计划一个任务在未来特定时间运行,你就需要访问事件循环。虽然我们不应该过度管理事件循环,但有时这是必要的。

2.8.1 手动创建事件循环

我们可以通过使用 asyncio.new_event_loop 方法来创建一个事件循环。这将返回一个事件循环实例。有了这个,我们就可以访问事件循环提供的所有低级方法。有了事件循环,我们就可以访问一个名为 run_until_complete 的方法,它接受一个协程并运行它直到完成。当我们完成事件循环后,需要关闭它以释放其使用的任何资源。这通常应在 finally 块中进行,以防异常抛出阻止我们关闭循环。使用这些概念,我们可以创建一个循环并运行一个 asyncio 应用程序。

import asyncioasync def main():    await asyncio.sleep(1)loop = asyncio.new_event_loop()try:    loop.run_until_complete(main())finally:    loop.close()

此代码清单中的代码与调用 asyncio.run 的情况相似,不同之处在于这不会执行取消任何剩余任务。如果我们想要任何特殊的清理逻辑,我们可以在 finally 块中完成。

2.8.2 访问事件循环

时不时地,我们可能需要访问当前正在运行的事件循环。asyncio 暴露了 asyncio.get_running_loop 函数,允许我们获取当前的事件循环。作为一个例子,让我们看看 call_soon,它将安排一个函数在事件循环的下一次迭代中运行。

import asynciodef call_later():    print("I'm being called in the future!")async def main():    loop = asyncio.get_running_loop()    loop.call_soon(call_later)    await delay(1)asyncio.run(main())

在上面的代码清单中,我们的 main 协程通过 asyncio.get_running_loop 获取事件循环,并告诉它运行 call_later,该函数接收一个函数并在事件循环的下一次迭代中运行它。此外,还有一个 asyncio.get_event_loop 函数,允许你访问事件循环。

这个函数在调用时如果没有运行的事件循环,可能会创建一个新的事件循环,从而导致奇怪的行为。建议使用 get_running_loop,因为它在没有运行的事件循环时会抛出异常,避免任何意外。

虽然我们不应在应用程序中频繁使用事件循环,但在某些时候,我们可能需要配置事件循环的设置或使用低级函数。我们将在下一节中通过调试模式的例子来展示如何配置事件循环。

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  1. CONNECT:[ UseTime:0.001120s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000998s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000328s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000270s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000574s ]
  6. SELECT * FROM `set` [ RunTime:0.000200s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000603s ]
  8. SELECT * FROM `article` WHERE `id` = 465944 LIMIT 1 [ RunTime:0.000424s ]
  9. UPDATE `article` SET `lasttime` = 1770502670 WHERE `id` = 465944 [ RunTime:0.010889s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000385s ]
  11. SELECT * FROM `article` WHERE `id` < 465944 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000632s ]
  12. SELECT * FROM `article` WHERE `id` > 465944 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000629s ]
  13. SELECT * FROM `article` WHERE `id` < 465944 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000664s ]
  14. SELECT * FROM `article` WHERE `id` < 465944 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000841s ]
  15. SELECT * FROM `article` WHERE `id` < 465944 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000785s ]
0.163326s