Quoted from unigroove:
For the upcoming 3rd Issue of Pinball Magazine, of which the cover story will focus on Python Anghelo, I've spoken with several people who were involved in the developement of the original game. The way it was told to me, and this will obviously be in the magazine in more detailed form, from the top of my head: one of the games was put on test together with a WCS. After a few weeks it turned out that WCS earned about $ 10.00, or $ 15.00, a week more than TPC, yet the price of TPC would be a bit higher than standard games. Williams felt that it made no sense to produce a game that would cost more and earn less, as operators would probably not be interested. So the project was cancelled.
The game in PHOF is apparently not complete as some features are missing, or never implemented. I have yet to see if there are any differences between the two existing games. Obviously this will be a very interesting project. Python was a firm believer that pinball needed to develop more outside of the box and TPC would be the future. Now we'll get to see how that will turn out. Best of luck to CMC with this project!
One of the parts not in the phof game is the python kick back. I had it in my pinball circus parts that I sold. Ill post pictures of it.