Python库urllib与urllib2主要区别分析

作为一个Python菜鸟，之前一直懵懂于urllib和urllib2，以为2是1的升级版。今天看到老外写的一篇《Python: difference between urllib and urllib2》才明白其中的区别 You might be intrigued by the existence of two separate URL modules in Python -urllib and urllib2. Even more intriguing: they are not alternatives for each other. So what is the difference