Doubt regarding form handling in mod_python

Hi,

       We have mod_python+cheetah setup for our web application. I have 
a form in cheetah template which on submit calls a python method. I want 
to do form validation in that method. The doubt i have is if I use

|"myform=req.form" |

what will my myform be? A dictionary of all form parameters as keys and 
values as values? or something else?

If its going to be dictionary, and assume if i have radio button group 
named as radio. How do i access the different members of that radio 
button group? As myform['radio'][0]? Or am i missing something?

Regards,
tamizhgeek