The fact that this was failing and went unnoticed so long seems like a good argument for being able to enable and disble py3kwarnings through Python.

Thanks to Wummel for the patch

in MacPython-OS9 and MacPython-OSX (or the equivalent unix Python on
Mac OS X). The only items remaining in Mac/Lib are modules that are
meaningful only for MacPython-OS9 (CFM stuff, MacPython preferences
in resources, etc).