python mod
--------------------
os https://segmentfault.com/a/1190000003061079
logging https://segmentfault.com/a/1190000003008066,https://segmentfault.com/a/1190000007617484
urllib https://segmentfault.com/a/1190000007340467
原文：http://www.cnblogs.com/moss_tan_jun/p/6237761.html