CentOS 6
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Install Python 3.3
The version of Python in CentOS 6 repository is 2.6 but Install 3.3 with RPM package if you need.
[1] It's possible to install from CentOS SCLo Software Collections.
It's OK to install it even if 2.6 is already installed because 3.3 is located on another PATH.
# install from SCLo

[root@dlp ~]#
yum --enablerepo=centos-sclo-rh -y install python33
[2] Packages from Software Collections are installed uder the /opt directory.
To use it, Load environment variables like follows.
# load environment variables

[root@dlp ~]#
scl enable python33 bash
[root@dlp ~]#
python -V

Python 3.3.2
[root@dlp ~]#
which python

[3] If you'd like to enable 3.3 automatically at login time, configure like follows.
[root@dlp ~]#
vi /etc/profile.d/python33.sh
# create new


source /opt/rh/python33/enable
export X_SCLS="`scl enable python33 'echo $X_SCLS'`"