[Python-Dev] problem after installing python 3.2.2

hi i have downloaded and installed python 3.2.2 but still when i use python in terminal it show's: root@debian:~# python Python 2.6.6 (r266:84292, Dec 27 2010, 00:02:40) [GCC 4.4.5] on linux2 Type "help", "copyright", "credits" or "license" for more information. how can i change the default to python 3.2.2? tHanks.