装机必备常用环境配置，不断更新中
1.pip
Install
On Debian and Ubuntu:
$ sudo apt-get install python-pip
Upgrade
On Linux or OS X:
pip install -U pip
2.virtualenv
Install
To install globally with pip (if you have pip 1.3 or greater installed globally):
$ [sudo] pip install virtualenv
Usage
$ virtualenv --python=python3 .env
python version here is necessary, after you activate the env,try which python
$ source .env/bin/activate
$ deactivate