[Python] How to investigate web script not running?

Hello


I'm trying to run my very first FastCGI script on an Apache shared
host that relies on mod_fcgid:
==============
#!/usr/bin/python
from fcgi import WSGIServer
import cgitb


# enable debugging
cgitb.enable()


def myapp(environ, start_response):
start_response('200 OK', [('Content-Type', 'text/plain')])
return ['Hello World!\n']


WSGIServer(myapp).run()
==============


After following a tutorial, Apache complains with the following when I
call my script:
==============
Internal Server Error


The server encountered an internal error or misconfiguration and was
unable to complete your request.
==============


Generally speaking, what tools are available to investigate issues
when running a Python web app?


Thank you.