If I'm not wrong, segmentation fault usually occurs when there are one or two missing libraries/not installed correctly. Some errors in the past also suggest this[1]. One of the users fixed it by installing pycrypto on his own.

How do you install python and pywallet? Maybe experienced people can help you more if you also post the full logs and your installation steps. CMIIW.

[1] https://github.com/jackjack-jj/pywallet/pull/13