FTR, on OS X, there is no standard mechanism provided by the Apple-supplied installer program to uninstall binary packages.  Thus, most third-party binary distributions for OS X that use the OS X installer can only be uninstalled manually unless they provide some custom uninstall script or package.  The python.org OS X installers have not provided such up to now, although it has been suggested in the past.  So this discussion does not currently apply to them.