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From: Ian Kelly <ian.g.kelly@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: subclassing collections.Counter
Date: Tue, 15 Dec 2015 09:11:30 -0700
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On Tue, Dec 15, 2015 at 8:49 AM, Pavlos Parissis
<pavlos.parissis@gmail.com> wrote:
> Hi,
>
> I need to store values for metrics and return the average for some
> and the sum for the rest. Thus, I thought I could extend
> collections.Counter class by returning averages for some keys.

Leave Counter out of it, as this is not what it's designed for. Write
a custom Metrics class, with each attribute being a pseudo-collection
that maintains a sum or average.