属性错误：模块'；异步'；没有属性'；WindowsSelectorEventLoopPolicy'；使用Python 3.6.10和Spyder 4.1

我正在尝试运行我在Anaconda中创建的环境（称为TensorFlow），其中安装了Python 3.6.10。原因是我想使用Keras和TensorFlow，但据我所知，Keras目前不支持Python3.7。Spyder和Jupyter笔记本电脑都是在我的基本环境（使用Python 3.7）上打开的，但在这一环境中不使用Python 3.6。下面是我继续遇到的错误：

Traceback (most recent call last):
File "C:\Users\...\Anaconda3\envs\tensorflow\lib\site-packages\spyder\app\mainwindow.py", line 3718, in main
mainwindow = run_spyder(app, options, args)
File "C:\Users\...\Anaconda3\envs\tensorflow\lib\site-packages\spyder\app\mainwindow.py", line 3559, in run_spyder
main.setup()
File "C:\Users\...\Anaconda3\envs\tensorflow\lib\site-packages\spyder\app\mainwindow.py", line 1010, in setup
from spyder.plugins.ipythonconsole.plugin import IPythonConsole
File "C:\Users\...\Anaconda3\envs\tensorflow\lib\site-packages\spyder\plugins\ipythonconsole\plugin.py", line 26, in 
from qtconsole.client import QtKernelClient
File "C:\Users\...\Anaconda3\envs\tensorflow\lib\site-packages\qtconsole\client.py", line 12, in 
from zmq.eventloop import ioloop, zmqstream
File "C:\Users\...\Anaconda3\envs\tensorflow\lib\site-packages\zmq\eventloop\__init__.py", line 3, in 
from zmq.eventloop.ioloop import IOLoop
File "C:\Users\...\Anaconda3\envs\tensorflow\lib\site-packages\zmq\eventloop\ioloop.py", line 78, in 
while _IOLoop.configurable_default() is not _IOLoop:
File "C:\Users\...\Anaconda3\envs\tensorflow\lib\site-packages\tornado\ioloop.py", line 328, in configurable_default
from tornado.platform.asyncio import AsyncIOLoop
File "C:\Users\...\Anaconda3\envs\tensorflow\lib\site-packages\tornado\platform\asyncio.py", line 34, in 
asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
AttributeError: module 'asyncio' has no attribute 'WindowsSelectorEventLoopPolicy'

据我所知：

• 我在这里的其他地方和GitHub上发现，当前版本的asyncio不支持Python3.6，尽管我对这些问题的了解从这里开始并结束

我所尝试的：

• 卸载和重新安装Spyder
• 创建一个新环境并在那里重新安装Spyder和Jupyer笔记本电脑

工作内容：

• 我在TensorFlow环境中升级到Python3.7，然后能够启动Spyder和Jupyter笔记本。然后我再次降级到Python3.6，由于前面提到的原因无法打开

如果这个问题看起来很基本，请道歉。感谢您的帮助