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.

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).

Cater for that by working from sys.executable.

argv emulation (i.e. if the end user drops files and folders on the
applets these will show up in sys.argv) BuildApplet will add the required
code to the applet bundle, in __rawmain__.pyc.

This code is compiled from appletrawmain.py, it creates sys.argv, cleans
up most of the mess and executes either __main__.py or __main__.pyc.