python 3.0 and above
Just google, "Install Python 3 in Linux"
You must be using Python 2.6.x Or Python 2.7.x While using HDP 2.6.x Or Amabri 2.6.x
Else you will not be on the tested & Certified configuration of Python.
Python3 can cause your cluster to now function properly specially when it is managed by Ambari.