Revolvers are "different" then automatics.
Automatic pistol parts can usually be installed with little fitting for just about everything other then the hammer and sear.
Revolver parts are almost all hand fitted and adjusted, and no revolver was more hand fitted and adjusted then the actions like the Python. Master fitters hand stoned and even bent parts to get a fit, then did more fitting to get the highly tuned Python action.
Point is, once the parts are fitted to a frame, they almost never fit another unless it's blind luck.
I've seen people try to build revolvers from S&W police guns that the frame was scrapped.
They'd manage to find a frame somewhere, but in almost all cases they had to buy more parts to get a fit on some.
It just never seemed to work out and the guns were seldom in proper working order.
In the case of a Python or other older type of Colt, it just isn't going to work.
My advice is to sell the parts one part at a time on Ebay or Gunbroker.com. You'll make enough money to to make a significant down payment on a good Python.
I'd even pull the front sight and pins and sell them separately. The barrel, cylinder assembly, hand, hammer, trigger, and bolt will bring the most.