asyncio 代码片段：获取运行中的事件循环或创建新循环

此 asyncio 代码片段展示如何获取运行中的事件循环，或在没有运行时创建新循环。

get_or_create_eventloop.py

import asyncio

def get_or_create_eventloop():
    try:
        return asyncio.get_event_loop()
    except RuntimeError as ex:
        if "There is no current event loop in thread" in str(ex):
            loop = asyncio.new_event_loop()
            asyncio.set_event_loop(loop)
            return asyncio.get_event_loop()
        else:
          raise

# Usage example:
get_or_create_eventloop().create_task(asyncio.sleep(1))

import asyncio

def get_or_create_eventloop():
    try:
        return asyncio.get_event_loop()
    except RuntimeError as ex:
        if "There is no current event loop in thread" in str(ex):
            loop = asyncio.new_event_loop()
            asyncio.set_event_loop(loop)
            return asyncio.get_event_loop()
        else:
          raise

# Usage example:
get_or_create_eventloop().create_task(asyncio.sleep(1))

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