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To: python-list@python.org
From: Mark Lawrence <breamoreboy@yahoo.co.uk>
Subject: Re: __init__ is the initialiser
Date: Sat, 01 Feb 2014 15:07:18 +0000
References: <lcgtpf$tui$1@ger.gmane.org> <mailman.6217.1391197950.18130.python-list@python.org> <52ec6d1f$0$29972$c3e8da3$5496439d@news.astraweb.com> <mailman.6275.1391257695.18130.python-list@python.org> <roy-644DCB.09404301022014@news.panix.com>
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On 01/02/2014 14:40, Roy Smith wrote:
> In article <mailman.6275.1391257695.18130.python-list@python.org>,
>   Ned Batchelder <ned@nedbatchelder.com> wrote:
>
>> The existence of __new__ is an
>> advanced topic that many programmers never encounter.  Taking a quick
>> scan through some large projects (Django, edX, SQLAlchemy, mako), the
>> ratio of __new__ implementations to __init__ implementations ranges from
>> 0% to 1.5%, which falls into "rare" territory for me.
>
>  From our own codebase:
>
> $ find . -name '*.py' | xargs grep 'def.*__new__' | wc -l
> 1
> $ find . -name '*.py' | xargs grep 'def.*__init__' | wc -l
> 228
>
> Doing the same searches over all the .py files in our virtualenv, I get
> 2830 (__init__) vs. 50 (__new__).
>

You could remove all 228 __init__ and still get your code to work by 
scattering object attributes anywhere you like, something I believe you 
can't do in C++/Java.  I doubt that you could remove the single __new__ 
and get your code to work.

-- 
My fellow Pythonistas, ask not what our language can do for you, ask 
what you can do for our language.

Mark Lawrence