list slice and generators

[Ian Kelly]

On Wed, Nov 25, 2015 at 10:44 AM, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> On Wed, Nov 25, 2015 at 3:07 AM, Peter Otten <__peter__ at 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.