https://www.zhihu.com/question/19717006
http://www.openfoundry.org/tw/tech-column/8536-introduction-of-python-extension-management-tools
http://qicheng0211.blog.51cto.com/3958621/1561685
本文出自 “Mr_Computer” 博客，请务必保留此出处http://caochun.blog.51cto.com/4497308/1728744
Python——pip, virtualenv, fabric三大神器
原文：http://caochun.blog.51cto.com/4497308/1728744