环境问题

背景： 换了电脑，当前的电脑原先就装着Python3.9.0
直接pip install d2l & torch can work
but when i start the jupyter, it use the anaconda SDK which is 3.6.4
so i need to install the d2l& torch under anaconda python sdk
but not work i cannot install it

below are the issues i met :

1. proxy issue coz i use the vpn so need to resolve it ---- after i fix the proxy, use
   conda install python=3.9.0 still not work （condarc control proxy issue need to add the cer in here and add the reflect net in here）
   So i search and find we can use the mult evn in conda,that’s cool! like
   roort evn — point to 3.6.5 & torch xxx
   d2l env — point to python 3.9.0 & torch 1.7.0

so i use below steps to create an env in conda

1. conda create -n evn_name python=3.9.0

2. active your new environment by use command “conda activate evn_name”
3. now check your python version
   python -V
4. if it works , now use the pip to install all your plugins
5. last steps but import, u must close your before jupyter
   and run the jupyter start in ur anaconda prompt under this new env…only do this , u can use the evn you want in the jupyter