**安装python3指向python

sudo apt-get install python3 
sudo ln -s /usr/bin/python3.6 /usr/bin/python

**更换源

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
sudo sed -i 's/security.ubuntu/mirrors.aliyun/g' /etc/apt/sources.list
sudo sed -i 's/archive.ubuntu/mirrors.aliyun/g' /etc/apt/sources.list
sudo apt update
sudo apt-get upgrade    


**创建虚拟环境
 

sudo apt install python3-venv
python -m venv myvnev
cd myvenv/bin/
source activate
#退出
deactivate

 

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