Sure you reuploaded the right code? I get the same error with that one 
Yup, I renamed it just in case your browser is caching the old version or something:http://we.lovebitco.in/pywallet-keyskip2.py
I modified this version of pywallet:
https://github.com/jackjack-jj/pywallet/blob/master/pywallet.py