[Python-ideas] sum(...) limitation

[Chris Kaynor]

On Wed, Aug 13, 2014 at 10:46 AM, Steven D'Aprano <steve at pearwood.info>
wrote:

> That's another semantic change: sum() currently accepts iterators
> (although not *infinite* iterators). This revision has now broken tens
> of thousands of applications.
>

okay, how about:

def sum(items, start=0):
    first = True
    for item in items:
        if first:
            start = start + item
        else:
            start += item
    return start

I believe that has the same effect as my other two, but only adds the
requirement that "value += item" behaves the same as "value = value + item".

Chris
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