Hi 

I am stuck on the following,  if no_of _items, dollars_items are not used 
the total_sale_price  is  left blank I get the follow message

compute=lambda r: r['no_of_items']*r['dollars_items']),
TypeError: unsupported operand type(s) for *: 'NoneType' and 'NoneType'

If I leave the no_by weight, cent_per_kg i get the following

compute=lambda r: r['estimated_weight']*r['no_by_weight']*r['cents_per_kg']),
TypeError: unsupported operand type(s) for *: 'NoneType' and 'NoneType'

              
                Field('no_of_items', 'integer'),
                Field('dollars_items', 'double'),
                Field('sub_total_items','double',
                      compute=lambda r: r['no_of_head']*r['dollars_hd']),
                Field('no_by_weight', 'integer'),
                Field('estimated_weight', 'double'),
                Field('cents_per_kg', 'double'),
                Field('sub_total_kg', 'double',
                      compute=lambda r: 
r['estimated_weight']*r['no_by_weight']*r['cents_per_kg']),
               Field('total_sale_price', 'double',
                      compute=lambda r: r['sub_total_hd'] 
+r['sub_total_kg']),


Where am I going wrong 

cheers 



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