Steven D'Aprano added the comment:

On 03/08/13 13:02, Alexander Belopolsky wrote:
>
> Alexander Belopolsky added the comment:
>
> Is there a reason why there is no "review" link?  Could it be because the 
> file is uploaded as is rather than as a patch?

I cannot answer that question, sorry.

> In any case, I have a question about this code in sum:
>
>                  # Convert running total to a float. See comment below for
>                  # why we do it this way.
>                  total = type(total).__float__(total)
>
> The "comment below" says:
>
>              # Don't call float() directly, as that converts strings and we
>              # don't want that. Also, like all dunder methods, we should call
>              # __float__ on the class, not the instance.
>              x = type(x).__float__(x)
>
> but this reason does not apply to total that cannot be a string unless you 
> add instances of a really weird class in which case all bets are off and the 
> dunder method won't help much.

My reasoning was that total may be a string if the start parameter is a string, 
but of course I explicitly check the type of start. So I think you are right.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18606>
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