To get lighttp to run python files, you need to tell it to do so. The standard configuration file that comes with Slitaz only allows scripts to be run in the /cg-bin/ folder. I guess this is personal preference – but I want to be able to run scripts everywhere! This can easily be changed ( the orginal line is commented out):

# $HTTP["url"] =~ "/cgi-bin/" {
$HTTP["url"] =~ "/" {
   ".cgi" => "/usr/bin/python",
   ".py" => "/usr/bin/python"

How hard can it be, right?