There is a very high probability that you already have Python installed on your system. You can confirm the same by using the following command
[root@white-magnet ~]# python Python 2.7.3 (default, Aug 1 2012, 05:16:07) [GCC 4.6.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>>
If Python is not present on your system, you can use Yum to install it on Fedora, CentOS, RHEL as shown below
[root@white-magnet ~]# yum install python
Or you can use apt-get to install it on Ubuntu, Debian, LinuxMint like:
[root@white-magnet ~]# apt-get install python