Python 3 RPMs are now available for RHEL/CentOS 6/7

“Python 3 is a new version of the language that is incompatible with the 2.x
line of releases. The language is mostly the same, but many details, especially
how built-in objects like dictionaries and strings work, have changed
considerably, and a lot of deprecated features have finally been removed…”

http://dl.iuscommunity.org/pub/ius/testing/CentOS/6/x86_64/repoview/python34u.html
https://iuscommunity.org/pages/Repos.html#release-packages