Python Introduction
Reference:
http://www.codedata.com.tw/python/python-tutorial-the-2nd-class-2-container-flow-for-comprehension/
http://technology-sea.blogspot.tw/2012/03/python-name-import.html
http://marco79423.twbbs.org/articles/%E6%B7%BA%E8%AB%87-python-%E7%9A%84%E5%B1%AC%E6%80%A7/