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From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: [newbie] Looking for a good introduction to object oriented programming with Python
Date: Sun, 05 Aug 2012 21:14:04 -0400
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Xref: csiph.com comp.lang.python:26598

On 06 Aug 2012 00:22:34 GMT, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> declaimed the following in
gmane.comp.python.general:

> Is this some sort of mystical "humans aren't objects, they're SPECIAL!!!" 
> rubbish? Because it sure sounds like it.
> 
> Can you give some non-religious reasons why you should not implement 
> human beings or aliases as objects?
>

	I think it's an over-simplification of humans being "actors" who
drive the software, and not something ("chess pieces") that the software
should be driving. (OTOH: how many remember that surge in "up-shift"
indicator lights on manual transmission cars, near the late 70s early
80s? The few times I drove one of those, it was telling me to up-shift
as soon as I let out the clutch from the previous up-shift).

	Though to me, that really means there should be no requirements
phrased as "the operator shall <do something to the software>"; it
should be "the software shall <respond to operator activity>".

	Taken literally, the prohibition would mean no modeling of Employees
in a payroll or HR system -- since Employee represents a person working
for the company.
> The emphasis on *names* is just jargon, design patterns are actually just 
> problem-solving techniques. Sometimes it's useful to have jargon that 
> everyone recognises, e.g. "factory function" and "singleton" are two I 
> consistently remember (and I use the first *all the time* and the second 
> *never*), but often Design Pattern proponents become side-tracked into 
> finer and finer differences of greater and greater abstraction, at the 
> expense of clarity.
>
	While I've probably used singletons (usually as sentinels in queues,
I suspect), but can't say that I've ever used a "factory function"...

-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/