[mod_python] How does mod_python handle concurrency?

We currently use time.strftime() in our CGI code after setting the TZ 
environment variable to the user's timezone.  Since I'm trying to move 
us away from the mod_python.cgi_handler to our own custom handler, in 
order to allow concurrent request handling, I was wondering how to get 
around the problem of having to update the TZ env var.

This dependency seems to be a problem for concurrent request 
processing.  Does anyone on this list have a trick for doing locale 
specific date formating while handling concurrent requests?

Also, does concurrent request processing in mod_python rely on a single 
Python process with multiple threads?  If so, are sys.exc_type and 
sys.exc_value shared between threads?  I'm on Apache 1.3 now but hope to 
move to Apache 2 soon.

Thanks,
Guy