thanks for response.
Sadly, my problem with <pre> is still here and is not related with mobi.
( debug/input is before conversion in mobi and I tryed conversion in epub too)
I will try downloading html and then convert in epub/mobi.
For django there is the option for downloading documentation in epub format, but there are other sites that I like convert in mobi for offline reading with my kindle.
Regards, Mauro