The older Colt action as used on the Python is totally different design than the action used on the later Colt's like the King Cobra and Anaconda.
The older action is noted for a smooth trigger action but does "stack" or get progressively heavier. Whether you like or hate these actions depends on whether you get used to it, or just hate it.
If you "grew up" on S&W's or Ruger's the Colt can seem quite odd.
The newer Colt actions are similar to the S&W and Ruger but still have a slightly different feel.
The Python was basically a hand assembled, hand fitted, hand polished and tuned custom built gun.
A lot of hand work went into tuning the trigger, and that's one reason the Python cost so much more.
A custom gunsmith who really knows Colt's can tune the Python to an even better, incredible level of smoothness.
The newer Colt's design doesn't allow much in the way of tuning since the parts are case hardened and any polishing will break through the coating, ruining the part.
So, with the newer guns, other than installing a spring kit, there's not much that can be done.
Bottom line is, the Python action is an extremely complex design dating back to the 1890's.
The newer guns are a totally new transfer bar design that, like the Ruger, just doesn't lend itself to the same smooth feel.