python3.5之mysql扩展
https://www.cnblogs.com/azhw/p/5113493.html
flask框架:Python 3.5下使用 flask_SqlAlchemy和mysql
https://blog.csdn.net/pp634077956/article/details/51167107
python的flask框架连接mysql数据库
https://blog.csdn.net/u011067966/article/details/53896478
Python __init__.py 作用详解
https://www.jianshu.com/p/73f7fbf75183
python函数参数*args**kwargs用法实例
https://www.jb51.net/article/44104.htm
python logging模块
https://www.cnblogs.com/dahu-daqing/p/7040764.html
Python中的注解“@”
http://blog.bibitiger.cn/blog/2017/04/17/pythondecoratorsforfunctions/
Python int与string之间的转化
https://blog.csdn.net/bug_moving/article/details/52885557
Python中的None与 NULL(即空字符)的区别
https://blog.csdn.net/li_danny/article/details/49815761
Python单例模式的4种实现方法
https://blog.csdn.net/ghostfromheaven/article/details/7671853
Python判断变量是否已经定义的方法
https://www.jb51.net/article/53904.htm
python函数嵌套
https://www.cnblogs.com/thinking-jxj/p/7681415.html
Python中对变量是否为None的判断
https://www.cnblogs.com/wangzhao2016/p/6763431.html
python中yield的用法详解——最简单，最清晰的解释
https://blog.csdn.net/mieleizhi0522/article/details/82142856