[web2py] I am trying to make pizza order page with web2py. What's the best way to store toppings info?

[Kenny]

I am just trying to make pizza order page with web2py.
I usually store quantity of pizza and id number in session.

But how can I store pizza topping info that user ordered in session?

I am not too familiar with python, so I don't know what would be the
best way to store it.

So session will have

{pizza_id, quantity}

and toppings under that pizza id.

Thank you.