About installing new Python version.

[king kikapu]

Hi to all,

i started with Python at v2.5 and now i see that a new version is
released.
As i already have a lot of stuff for Python installed in the site-
packages directory, which is the correct way to install a new Python
version without do any damage ?

Remove Python and ALL Python related software and install them all
over again (painful)?
Remove Python and do not touch anything else and install new version
on top of them at the same directory ?
Any other choice available ?

Thanks a lot for any help!