rtar.py version 0.4.0
More than nine years passed since I touched the source code of this tool. I still use it on a regular basis and needed/wanted LZMA compression as this has found its way into GNU tar for some time now.
After all this time only Python 2.7 is supported as older 2.x versions are obsolete or at least fading from general use. I feel sorry for the poor souls stuck on CentOS systems. ;-)
Head over to the project page for more information or downloading the tool.