将libopenflow_01.py的1075行的if (type(ipOrIPAndBits的if改为elif，即可
解决方案来自:https://www.mail-archive.com/pox-dev@lists.noxrepo.org/msg01222.html
On first glance... I think this may be a bug in libopenflow_01.py. I‘m pretty surprised it hasn‘t been noticed until now since it appears to be very old.
Can you try changing libopenflow_01.py around like line 1075 in
_make_addr()("if (type(ipOrIPAndBits...") from an "if" to an "elif"?原文：https://www.cnblogs.com/ShaneSun/p/9117392.html