Installing Python 3.3 with LZMA/XZ on Mac OS X
Peter Cock · 2012
Today's release of Python 3.3 includes the lzma module in the standard library for LZMA/XZ files, but it didn't work 'out of the box' under Mac OS X 10.8 Mountain Lion - it requires XZ Utils. This is how I installed it. At the time of writing Python 3.3 doesn't come pre-compiled for Mac OS X 10.8 Mountain Lion (only older versions of OS X), so I built it from source (having installed XCode via the App Store for free).