getting the path in a cgi script

[Kalle Anke]

I know I've done this once before ... I think ... but now I can't figure out 
how to do it

I've set my web server to use an alias similar to this

   ScriptAlias /xx/ "/Library/WebServer/CGI-Executables/xxx.cgi/"

which makes it possible for me to write

   http://127.0.0.1/xx/some/kind/of/path

my problem is that I don't know how to get the 'some/kind/of/path' part of 
the URL in my script.

I know that I can do like this in perl

   $documentRoot.path_info();

but how do I do it in python?