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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Thu, 4 Oct 2012 15:04:53 -0600
Subject: Re: sum function
To: Python <python-list@python.org>
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Xref: csiph.com comp.lang.python:30745

On Thu, Oct 4, 2012 at 2:52 PM,  <mike20007@gmail.com> wrote:
> scanner = client.scannerOpenWithStop("tab", "10", "1000", ["cf:col1"])
> total = 0.0
> r = client.scannerGet(scanner)
> while r:
>   for k in (r[0].columns):
>     total += float(r[0].columns[k].value)
>   r = client.scannerGet(scanner)
>
> print total
>
> Do you know of better (faster) way to do sum?

scanner = client.scannerOpenWithStop("tab", "10", "1000", ["cf:col1"])
next_r = itertools.partial(client.scannerGet, scanner)
total = sum(float(col.value) for r in iter(next_r, None) for col in
r.itervalues())