Please explain Shunyata Python/Alpha lineup

Could anyone please explain Shunyata Python/Alpha (power cables) lines to me?

There were Shunyata Python, Python Alpha, Python Alpha Helix, Alpha NR, Alpha HC, Alpha VX, Alpha Z-tron etc. And from what I read it all sounded differently.

What’s the timeline for these models?

I am particularly interested in Python Alpha (red heat shrinks) - the sound signature, manufacture ages and how it compares to other Pythons/Alphas ?

Many thanks!