https://ke.qq.com/course/350925     Python开发21天入门

https://www.ubuntu.com/index_kylin

http://www.ubuntu.org.cn/global

http://www.runoob.com/python/python-operators.html        Python 运算符

https://www.python.org/      pytharm下载地址

https://www.icourse163.org/course/HIT-154005    中国大学MOOC

 https://stackoverflow.com/     栈溢出

https://stackoverflow.com/         全球领先的软件开发平台·GitHub