有一段协程代码如下，在PyCharm中能够正确运行，在jupyter notebook中确报错RuntimeError: This event loop is already running。

import asyncio
import requests

async def request():
    url = 'https://www.baidu.com'
    status = requests.get(url)
    return status
    
def callback(task):
    print('Status:', task.result())
 
coroutine = request()
task = asyncio.ensure_future(coroutine)
print('Task:', task)

loop = asyncio.get_event_loop()
loop.run_until_complete(task)
print('Task:', task)
print('Task Result:', task.result())

解决办法是封装event loop，参考https://pypi.org/project/nest-asyncio/
，具体如下：
1.pip3 install nest_asyncio
2.在协程代码开头，加上如下两行：

import nest_asyncio
nest_asyncio.apply()