By the time you're looking at deploying to hundreds or thousands of hosts, it seems that you would be creating and controlling your own repo's. Thankfully building Python is straight forward, so building a rpm shouldn't be too painful.
Though it did seem odd that there wasn't already a repo for Python 3, so a little googling found this -
Though it did seem odd that there wasn't already a repo for Python 3, so a little googling found this -
http://iuscommunity.org/pages/About.html