机器学习之数学基础（转自 https://github.com/Visualize-ML/Book3_Fundamentals-of-Mathematics ）
Code samples from the "Python Cookbook, 3rd Edition", published by O'Reilly & Associates, May, 2013.
Multifarious Scrapy examples. Spiders for alexa / amazon / douban / douyu / github / linkedin etc.
