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There are three popular Python distributions for Mac OS X.

There is the pre-installed distribution that ships as /usr/bin/python and has its frameworks in /System/Library/Frameworks.

There is also MacPython, the Python distribution from the macpython.org guys (and
pointed to by python.org). This is a 3rd-party Python distro. This installs as
/usr/local/bin/python with its frameworks in /Library/Frameworks.

Then there is ActivePython, our distribution. This also installs as /usr/local/bin/python with its frameworks in /Library/Frameworks -- the same location as MacPython. When ActivePython is being installed the installer will look for MacPython and prompt to move it out of the way, rather than overwrite it. Because of the way Mac OS X works you can only have one of MacPython or ActivePython as the "current" python at a time.

The ActivePython install notes show how to uninstall ActivePython:

http://aspn.activestate.com/ASPN/docs/ActivePython/2.4/installnotes.html#osxpkg_uninstall

Note that this will not restore the MacPython install (it is still
there, just moved to the side). That same "pydistro.py" script used to
uninstall also has the ability to restore the MacPython install, but it
is a little bit of a chicken and egg problem because uninstall
ActivePython will uninstall "pydistro.py".

Solution:

- copy pydistro.py to a safe place (say ~/tmp), then run this to
uninstall ActivePython

sudo /usr/bin/python pydistro.py activepython_uninstall 2.4

- then this to restore MacPython
sudo /usr/bin/python pydistro.py macpython_restore 2.4

That should work, but isn't too heavily tested.

OR:

Just re-install MacPython from its original installer package.