Hi Benjamin,

> I am trying to follow the kwant tutorial but there is a problem when

> downloading tutorial files.

Thanks for letting us now.  It should work now.  (The problem was due to
a misconfiguration of the web server that treated .py files as CGI
scripts.)

> I am working on my own implementations of quantum transport and I want
> to compare my results with those of kwant.

Please consider contributing to Kwant.  Our main motivation behind
releasing it as free software is to stimulate the sharing and reuse of
code in the quantum transport community.