python as a cgi script engine

[jilly]

i use "http://localhost/CGI/python.exe?hello.py" ,then i succeed.
 but when i use "http://localhost/CGI/hello.py" ,i failed.
 and i have setted scriptmap in the IIS
(just like:".py-->c:\python21\python.exe -u").

The context is:
     windows 2000 and IIS server

Please help me
Thanks first!