Chuckbuster
CGN Ultra frequent flyer
Due to their cost, Pythons were rarely issued to police forces. A couple of exceptions were Colorado State Patrol and Florida Highway Patrol which issued them at different times. Actually Colt revolvers were not very common as S&W owned the police market until Glock came along and took it away from them when semi autos were widely adopted.
My agency issued Webleys back in the day, but allowed personally owned revolvers to be carried as long as they were blued S&W or Colt 4" to 6" barreled six shot revolvers that could chamber .38 Special and pass an inspection by an armourer. The Webleys were so bad they were nicknamed "Wobbly Webleys" and were chambered in the anemic .38 S&W so most members bought their own guns. Notice I said could chamber .38 Special? That meant a lot of .357 Magnums were bought as personal owned duty guns. Also a surprising number of 5" S&W Model 27's were bought as well as a few Pythons. I think if an inspection of a locker or duty bag was done, a box or a few speedloaders of .357 Magnum ammo might have been discovered.
In the same vein, as a student way back in the 80s, I recall a shooting involving Peel Regional Police in which an officer shot and killed a suspect; following which hell was raised. One of the strikes against the officer was the fact that he was using .38 +P hollow points obtained from a friend in the RCMP; the family, legal system, and of course activists made a huge stink about the ammunition.