anaconda spyder使用协程报错解决：RuntimeError: This event loop is already running

本文链接：https://blog.youkuaiyun.com/zhangpeterx/article/details/103832253

在Anaconda的Spyder环境中编写协程代码时遇到'RuntimeError: This event loop is already running'错误。该问题在GitHub上已有讨论，可能由于Spyder或aiohttp、asyncio与IDE的不兼容导致。尝试更新到最新版本未解决问题。解决方案包括：1) 不使用Spyder内核，改用Jupyter Notebook或终端运行程序；2) 安装`nest-asyncio`库，并在代码开头导入。

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早上在anaconda的spyder中写协程代码时遇到了报错。
代码如下：

import asyncio

async def coroutine():
    print("hey")
    await asyncio.sleep(1)

asyncio.get_event_loop().run_until_complete(coroutine())

报错如下：

Python 3.7.4 (default, Aug  9 2019, 18:34:13) [MSC v.1915 64 bit (AMD64)]
Type "copyright", "credits" or "license" for more information.

IPython 7.8.0 -- An enhanced Interactive Python.
In [1]:runfile('C:/Users/peter/untitled0.py', wdir='C:/Users/peter')
Traceback (most recent call last):

  File "<ipython-input-1-cf6eb8713524>", line 1, in <module>
    runfile('C:/Users/peter/untitled0.py', wdir='C:/Users/peter')

  File "C:\Users\peter\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 827, in runfile
    execfile(filename, namespace)

  File "C:\Users\peter\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 110, in execfile
    exec(compile(f.read(), filename, 'exec'), namespace)

  File "C:/Users/peter/untitled0.py", line 7, in <module>
    asyncio.get_event_loop().run_until_complete(coroutine())

  File "C:\Users\peter\Anaconda3\lib\asyncio\base_events.py", line 566, in run_until_complete
    self.run_forever()

  File "C:\Users\peter\Anaconda3\lib\asyncio\base_events.py", line 521, in run_forever
    raise RuntimeError('This event loop is already running')

RuntimeError: This event loop is already running

这个问题在GitHub上已经有人提过了：
“RuntimeError: This event loop is already running”; debugging aiohttp, asyncio and IDE “spyder3” in python 3.6.5 · Issue #7096 · spyder-ide/spyder
async support by minrk · Pull Request #323 · ipython/ipykernel
问题出现的原因是IPython/ipykernel不支持asyncio。
根据说明，IPython最新版本可能修复了问题，先尝试更新到最新版本IPython 7.10.2。
没解决问题。

解决方法1

不用spyder，用pychram或者终端直接跑程序，就没这个问题。

解决方法2

安装nest_asyncio：

pip install nest_asyncio

在代码开头加上：

import nest_asyncio
nest_asyncio.apply()