But you don't overwrite OSX's python, the new version is installed side-by-side. The installation also creates links to the new version into /usr/local/bin, so

But you don't overwrite OSX's python, the new version is installed side-by-side. The installation also creates links to the new version into /usr/local/bin, so that it doesn't mess up the system's python. Never had any trouble with this.