> So expat doesn't count as that literally wraps the expat library.
XML parser can be implemented in pure Python. There are a lot of XML parsers
implemented in different programming languages.
> Random
> also requires accessing the system randomization libraries to work
> properly so I don't think that is a candidate either.
No, random have C implemented some basic methods only for speed. It uses
time() system function for initial seeding, but time() is accessible from pure
Python too.
Some OS-specific modules (pwd, grp, spwd, resource, ossaudiodev, etc) can be
implemented in pure Python on some platforms (using I/O and ioctl on special
files in /etc, /dev or /proc).