Message 241586 - Python tracker

Message241586

Author	eric.snow
Recipients	Claudiu.Popa, belopolsky, christian.heimes, eric.snow, ethan.furman, ionelmc, jedwards, llllllllll, r.david.murray, rhettinger, steven.daprano, terry.reedy
Date	2015-04-20.01:43:08
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<CALFfu7AL+9MSeMN156PcgVuoMDzCNphQ0e-0-TWKLm4mQHzvAQ@mail.gmail.com>
In-reply-to	<CANkHFr-Aq4DUf6ViVfHhYYEH25opGNgQz0hriMf2xYmvKWwLbQ@mail.gmail.com>

Content
> Ionel Cristian Mărieș added the comment: > It's not. Did you see the example with iter()/__iter__? It does convert > the AttributeError into a TypeError. callable and iter are not the same thing though. callable checks for a capability. iter invokes a capability. The direct comparision would be collections.abc.Iterable.__subclasshook__ (e.g. isinstance(obj, Iterable)), which behaves exactly like callable does (does not invoke the descriptor protocol). See Lib/_collections_abc.py.

Content

> Ionel Cristian Mărieș added the comment:
> It's not. Did you see the example with iter()/__iter__? It does convert
> the AttributeError into a TypeError.

callable and iter are not the same thing though.  callable checks for
a capability.  iter invokes a capability.  The direct comparision
would be collections.abc.Iterable.__subclasshook__ (e.g.
isinstance(obj, Iterable)), which behaves exactly like callable does
(does not invoke the descriptor protocol).  See
Lib/_collections_abc.py.

History
Date	User	Action	Args
2015-04-20 01:43:08	eric.snow	set	recipients: + eric.snow, rhettinger, terry.reedy, belopolsky, christian.heimes, ionelmc, steven.daprano, r.david.murray, Claudiu.Popa, ethan.furman, llllllllll, jedwards
2015-04-20 01:43:08	eric.snow	link	issue23990 messages
2015-04-20 01:43:08	eric.snow	create