LESS is an extension of CSS. You can write LESS code just like you would write CSS, except you need to compile it to CSS. That's what the package is for.
Download and extract the distribution and then from the command prompt type:
$ python setup.py install
Command line tool is called lessc.py, and is used like this:
$ lessc.py source [destination]
The source is the LESS file you want to compile, and the destination is the (optional) CSS file you want to compile it to:
$ lessc.py style.less style.css
If you did't specify a destination, lessc.py will output to stdout:
$ lessc.py style.less
Probably full of bugs with "potentially" all features apart from namespaces and accessors.
Currently this has all the features that I require, but lacks full compatibility with LessCSS.