PEP 8 exegetics: conditional imports?

[alex23]

Peter Otten <__pete... at web.de> wrote:
> This criterion is unlikely to be met for the examples you give above. time
> is a built-in module, and gzip a thin wrapper around zlib which is also
> built-in.

This is something I was _utterly_ unaware of. Is there a list of what
modules are built-in readily available?

The only reference[1] I could find via Google doesn't list zlib at
all.

[1]: http://www.vldb.informatik.hu-berlin.de/Themen/manuals/python/python-texinfo/built-in_modules.html