[CentralOH] Python 3.x

[Mark Erbaugh]

What are people's favorite references for Python 3.x for experienced 2.x users?

I'm contemplating converting a proprietary non-Python system that I've obtained the rights to to Python. The end result would be distributed as source code (not sure if it would open source or proprietary). The intended market is VARs who customize the system for their clients,  although in many cases the current system is used as-is.  The current project has been around 15 years, and i would hope for a similar run for the converted version.  Since I would be starting from scratch, code-wise, does it make more sense to start with Python 3.x?

Thanks,
Mark

*I would like to be able to distribute the system as open source, but it even though I was one of the developers of the current system, it will take hundreds of hours of my time to convert and I'm looking for something that will generate an income stream for me.  Does anyone have any experience or suggestions on making a living (or a significant part of one) distributing an open source package?