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Thu Jan 20 09:09:36 CET 2005 · https://mail.python.org/pipermail/python-dev/2005-January/051213.html

On 2005 Jan 20, at 02:47, Skip Montanaro wrote:

>     Phillip> Actually, this is one of those rare cases where 
> optimization
>     Phillip> and clarity go hand in hand.  Human brains just don't 
> handle
>     Phillip> nesting that well.  It's easy to visualize two levels of 
> nested
>     Phillip> structure, but three is a stretch unless you can abstract 
> at
>     Phillip> least one of the layers.
>
> Also, if you think about nesting in a class/instance context, 
> something like
>
>     self.attr.foo.xyz()
>
> says you are noodling around in the implementation details of 
> self.attr (you
> know it has a data attribute called "foo").  This provides for some 
> very
> tight coupling between the implementation of whatever self.attr is and 
> your
> code.  If there is a reason for you to get at whatever xyz() returns, 
> it's
> probably best to publish a method as part of the api for self.attr.

Good point: this is also known as "Law of Demeter" and relevant 
summaries and links are for example at 
http://www.ccs.neu.edu/home/lieber/LoD.html .

Alex

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[Python-Dev] Re: Zen of Python