[Python-Dev] descriptor as instance attribute

Mon Jan 9 16:51:35 CET 2012

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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.