[Python-Dev] descriptor as instance attribute
Oleg Broytman
phd at phdru.name
Mon Jan 9 16:51:35 CET 2012
Hello.
We are sorry but we cannot help you. This mailing list is to work on
developing Python (adding new features to Python itself and fixing bugs);
if you're having problems learning, understanding or using Python, please
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you for understanding.
On Tue, Jan 10, 2012 at 01:32:13AM +1100, Jon Wells wrote:
> I can't find an answer to this grovelling through get user info. on
> descriptors.
Read carefully http://users.rcn.com/python/download/Descriptor.htm
> Assuming desc() is a data descriptor class why are the following not the
> same???
>
> class poop(object):
> var = desc()
>
> and
>
> class poop(object):
> def __init__(self):
> self.var = desc()
>
> In the second form the descriptor protocol for access to 'var' is
> ignored.
From http://users.rcn.com/python/download/Descriptor.htm:
...transforms b.x into type(b).__dict__['x'].__get__(b, type(b))..
Please note the first type(b).
Oleg.
--
Oleg Broytman http://phdru.name/ phd at phdru.name
Programmers don't die, they just GOSUB without RETURN.
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