Re: Class: @property -> .dict

From	Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de>
Newsgroups	comp.lang.python
Subject	Re: Class: @property -> .__dict__
Date	2011-12-16 11:02 +0100
Organization	A newly installed InterNetNews server
Message-ID	<jcf50g$716$1@r03.glglgl.gl> (permalink)
References	<ad04c206-dbfd-4e49-b365-943b47844c41@n6g2000vbg.googlegroups.com>

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Am 16.12.2011 09:52 schrieb Ulrich:

> Could anyone please explain me why this does not work / how to get b
> into .__dict__ / hint me to an explanation?

b is not a data element of the particular instance, but it lives in the 
class. It is, roughly spoken, a "kind of method", just to be used 
without calling. These things are called "data descriptors" 
(http://docs.python.org/reference/datamodel.html#descriptors).

t.b is internally reflected to te.__dict__['b'].__get__(t, te) in order 
to call the __get__ method of the property object. This is done on every 
call and the value is, in your case, derived from the instance value a.

HTH,

Thomas

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Class: @property -> .__dict__ Ulrich <ulrich@dorda.net> - 2011-12-16 00:52 -0800
  Re: Class: @property -> .__dict__ Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-16 09:03 +0000
    Re: Class: @property -> .__dict__ Ulrich <ulrich.dorda@gmail.com> - 2011-12-16 01:11 -0800
      Re: Class: @property -> .__dict__ Ulrich <ulrich.dorda@gmail.com> - 2011-12-16 01:14 -0800
        Re: Class: @property -> .__dict__ Peter Otten <__peter__@web.de> - 2011-12-16 10:32 +0100
        Re: Class: @property -> .__dict__ Ian Kelly <ian.g.kelly@gmail.com> - 2011-12-16 09:23 -0700
  Re: Class: @property -> .__dict__ Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2011-12-16 11:02 +0100

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