I wouldn't even bother with pywallet or any other Bitcoin Core alternative even if they are open source. With Bitcoin Core you get the most peer reviewed software, with pywallet you get a wallet that has less people looking for exploits, which is a less secure software in principle. Why bother?
I don't think anyone uses
pywallet as a wallet. It's a tool meant for data recovery, see
[GUIDE] Recover your deleted keys.
Or rather, no one can use pywallet as wallet. After all, pywallet does not have wallet feature/functionality despite it's name.