How do I uninstall python 3.2.2 on Mountain Lion?
If you used the installer from python.org, remove these directories:

sudo rm -r /Library/Frameworks/Python.framework /Applications/Python\ 3.* /Library/Receipts/Python*-3.*.pkg

You can see what files are copied by the installer by pressing command-I, or with lsbom:

lsbom Python.mpkg/Contents/Packages/*.pkg/Contents/Archive.bom