Originally Posted by YankeePride13
First, uninstall the older version of Python. Then places the python binary in your PATH.
Do NOT uninstall Python! The entire package management system in RHEL/CentOS is based on python. If you uninstall the old version there's a good chance you'll break the package management system on your machine.
OP - did you install ALL of python version 3.2.5, or just that package? Is the new version of python in your PATH? Have you tried looking in the standard or optional repos for your distribution to see if the argparse package is available for the version of python you already have? It looks like it's available in the EPEL repo (extra packages for enterprise linux).
# yum list | grep -i argparse
python-argparse.noarch 1.2.1-2.el6 epel
You do not want to go futzing around with different versions of python on a RHEL/CentOS/SL system, it's VERY easy to break things. Stick with the default version and use yum to add/remove packages like this.