##数据库
flask与数据库交互插件:Flask-SQLAlchemy:The Python SQL Toolkit and Object Relational Mapper
数据库:SQLite
案例:购书系统
参考:flask教程, [flask-mega-tutorial]
[flask-mega-tutorial]http://www.pythondoc.com/flask-mega-tutorial/
html5 EDX opencourse:https://www.edx.org/xseries/html5-w3c?utm_source=Course+Announcements+Mailing+List&utm_medium=email&utm_content=title&utm_campaign=Student_Newsletter_September_29
##算法 周期提醒(重复事件)
条件过滤
项目合并(数据库操作)