Python Asyncio 事件循环已关闭
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Asyncio Event Loop is Closed
提问by TryingToTry
When trying to run the asyncio hello world code example given in the docs:
尝试运行文档中给出的 asyncio hello world 代码示例时：
import asyncio
async def hello_world():
print("Hello World!")
loop = asyncio.get_event_loop()
# Blocking call which returns when the hello_world() coroutine is done
loop.run_until_complete(hello_world())
loop.close()
I get the error:
我收到错误：
RuntimeError: Event loop is closed
I am using python 3.5.3.
我正在使用 python 3.5.3。
回答by Martijn Pieters
You have already called loop.close()before you ran that sample piece of code, on the global event loop:
loop.close()在运行该示例代码之前，您已经在全局事件循环中调用了：
>>> import asyncio
>>> asyncio.get_event_loop().close()
>>> asyncio.get_event_loop().is_closed()
True
>>> asyncio.get_event_loop().run_until_complete(asyncio.sleep(1))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/.../lib/python3.6/asyncio/base_events.py", line 443, in run_until_complete
self._check_closed()
File "/.../lib/python3.6/asyncio/base_events.py", line 357, in _check_closed
raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed
You need to create a newloop:
您需要创建一个新循环：
loop = asyncio.new_event_loop()
You can set that as the new global loop with:
您可以将其设置为新的全局循环：
asyncio.set_event_loop(asyncio.new_event_loop())
and then just use asyncio.get_event_loop()again.
然后asyncio.get_event_loop()再次使用。
Alternatively, just restart your Python interpreter, the first time you try to get the global event loop you get a fresh new one, unclosed.
或者，只需重新启动 Python 解释器，第一次尝试获取全局事件循环时，您会得到一个全新的未关闭的。
