Python versions 2.7 and 3.4 are maintained by Community Maintainer Alyssa Frazee. If you simply invoke
python from the command line you will get the default version of python that comes with the current version of RHEL6. The command
python --version will tell you which version of python you are running.
python3 you must first load the python3 module file, i.e.
module load python3
and then invoke it with the
python3 command. If you don’t know about modulefiles, please take a look at the documentation.