python:virtualenv安装python2和python3虚拟环境

sudo apt install python-virtualenv
# virtualenv在原python2和python3下都会安装

# 分别安装python2和python3的虚拟环境
virtualenv -p /usr/bin/python2 ~/venv/py2env/
virtualenv -p /usr/bin/python3 ~/venv/py3env/

# 使用虚拟环境
source ~/venv/py2env/bin/activate

# 退出虚拟环境
deactivate

# 删除虚拟环境
rm -rf ~/venv/py2env