finding domain name

[Bobby Roberts]

hi group.  I'm new to python and need some help and hope you can
answer this question.  I have a situation in my code where i need to
create a file on the server and write to it.  That's not a problem if
i hard code the path.  However, the domain name needs to be dynamic so
it is picked up automatically.  The path to our websites is

home/sites/xxxxx/

where xxxxx represents the domain name.

How can I find the domain name of the current url being viewed.