You can find here an experimental build of VPython 5.32. It should run on PPC Macs running Leopard (10.5) or Tiger (10.4). You need to install Python 2.6.4 before running this installer. Let me know if you have any trouble! Thanks, Steve Spicklemire.

Python 2.6.4 Installer

Experimental VPython 5.32 Installer