need assisstance to set python2.7 as default & Django to install

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http://stackoverflow.com – I am not able to install Django.I am using CentOS 5,not able to set python2.7 environment variable.Priviously in my system python2.4.3 is available,but after installing python 2.7 in the terminal i checked the version avail in system using "python -V"cmd it executed as python 2.4.3.But if i checked using "python2.7 -V"cmd it is showing python2.7.Please help me with this..... 1.I need to set python2.7 as default version. 2.Help me with the installation of Django. (HowTos)