How To Sum 2 Columns In Django Get_context_data()

I want to return total value as revenue variable in get_context_data method of ClassBasedView. I also want to return another operation: total - shipping_cost as revenue_no_shippin

Solution 1:

Something like this might work for how to sum two columns using django:

qs.aggregate(revenue_no_shipping=Sum(F('total') - F('shipping_cost')))