for such operations i use, for example, review.votes = review.votes if
review.votes is not None else 0 so i can do operations on it.

On Mar 3, 10:26 pm, mdipierro <mdipie...@cs.depaul.edu> wrote:
> I can see there is a bug in web2py in that respect since it assumes
> integer while it should be of the same type as the field being summed.
> I fixed it in trunk. Anyway, that is not your problem. can I see how
> you are using it?
>
> On Mar 3, 1:39 pm, Philip <philip.el...@gmail.com> wrote:
>
>
>
> > I have a DAL field of type 'double'. What python data type is
> > row._extra[db.table.field.sum()] for that field?
>
> > Assuming it was a python float, I tried to perform an arithmetic
> > operation on it, and an error came back that the type was 'NoneType'
> > so the operation could not be performed. I can't tell if this is an
> > error on my part.
>
> > Thanks,
> > Philip

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