You need the epel repository which you probably do not have in your older version of CentOS 6.4.

Look at this page https://fedoraproject.org/wiki/EPEL  read under

How can I use these extra packages?

you need to get the repo, then enable the repo and install python, I think you will get all the software you need installed that way.

yum --enablerepo=epel install python26-devel

or some command like that.

Hope this helps.