运行器 ¶

源代码： Lib/asyncio/runners.py

此节提纲了运行 asyncio 代码的高级 asyncio 原语。

它们的构建是基于 事件循环 旨在简化常见广泛零散情景下的 async 代码使用。

运行异步程序 ¶

asyncio. run ( coro , * , debug = None , loop_factory = None ) ¶

执行 协程 coro 并返回结果。

此函数运行传递的协程，负责管理 asyncio 事件循环， 定稿异步生成器 , and closing the executor.

无法调用此函数，当另一 asyncio 事件循环在同一线程中运行时。

若 debug is True ，以调试模式运行事件循环。 False 明确禁用调试模式。 None 用于遵守全局 调试模式 设置。

若 loop_factory 不是 None , it is used to create a new event loop; otherwise asyncio.new_event_loop() is used. The loop is closed at the end. This function should be used as a main entry point for asyncio programs, and should ideally only be called once. It is recommended to use loop_factory to configure the event loop instead of policies. Passing asyncio.EventLoop allows running asyncio without the policy system.

The executor is given a timeout duration of 5 minutes to shutdown. If the executor hasn’t finished within that duration, a warning is emitted and the executor is closed.

范例：

async def main():
    await asyncio.sleep(1)
    print('hello')
asyncio.run(main())