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From: Emile van Sebille <emile@fenx.com>
Subject: Re: dunder-docs (was Python is DOOMED! Again!)
Date: Sun, 01 Feb 2015 12:51:58 -0800
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Xref: csiph.com comp.lang.python:85029

On 2/1/2015 12:45 PM, Chris Angelico wrote:
> Simple answer: You write dunder methods and the interpreter calls
> them. You don't call them yourself.
>
> I can't currently think of any situation where it's appropriate to
> call a dunder method manually (cue the swamping of such situations on
> the list); you just call dir() or the + operator or whatever it be.

calling the parent dunder method from within the overiding new method 
comes to mind.

Emile