python virtualenv basic command: 一些基本的python virtuel environment的指令。

install virtualenv in ubuntu 18.04

$ wget https://bootstrap.pypa.io/get-pip.py

$ sudo python3 get-pip.py

$ sudo pip install virtualenv virtualenvwrapper

$ sudo rm -rf ~/get-pip.py ~/.cache/pip

 python   virtualenv basic command: 

workon: list all your virtual environments.

mkvirtualenv: create a new environment

e.g. >mkvirtualenv mlpy37env -p python3.7

rmvirtualenv: remove a exists environment.

deactivate： akes you to your system environment. You can activate any of your virtual environments again at any time。