HTML+CGI (if __name__ == '__main__')

[marienbad]

You have commented out the lines where it gets the actual form data:

# Create instance of FieldStorage
    #form = cgi.FieldStorage()

    # Get data from fields
    #first_name = form.getvalue('first_name')
    #last_name = form.getvalue('last_name')

Does uncommenting these change things?

Also, what does the file it searches look like?