Nope.
According to my Gun Parts Corp. catalog, the Python is an "I" frame (along with the original Trooper) and the Trooper Mk III is a "J" frame, so Python grips are a no-no.
Supposedly anything made for a Lawman MK V, Lawman MK III, Metropolitan MK III, Official Police MK III, Peacekeeper, Trooper MK V will be good.
Gun Parts Corp lists at least three styles of wooden grips that should work.