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From: Ian Kelly <ian.g.kelly@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: list slice and generators
Date: Wed, 25 Nov 2015 10:45:54 -0700
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On Wed, Nov 25, 2015 at 10:44 AM, Ian Kelly <ian.g.kelly@gmail.com> wrote:
> On Wed, Nov 25, 2015 at 3:07 AM, Peter Otten <__peter__@web.de> wrote:
>>>     elif name in METRICS_AVG:
>>           # writing a function that calculates the average without
>>           # materialising the list left as an exercise ;)
>
>         metrics = itertools.tee(metrics)
>         return int(sum(metrics[0]) / len(metrics[1]))

Actually, don't do that. It does effectively materialize the list,
just not as a list.