Message 257063 - Python tracker

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Author	abarnert
Recipients	abarnert, abarry, curioswati, gvanrossum, r.david.murray, rhettinger, serhiy.storchaka, terry.reedy
Date	2015-12-27.02:37:07
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<[email protected]>
In-reply-to

Content
> This sounds good. Also, reversed() could then be modified to produce a better error. Should `iter` also be modified to produce a better error if `__iter__` is None? Also, should this be documented? Maybe a sentence in the "Special method names" section of the "Data model" chapter, like this: > To indicate that some syntax is not supported, set the corresponding special method name to None. For example, if __iter__ is None, the class is not iterable, so iter() will not look for __getitem__.

> This sounds good. Also, reversed() could then be modified to produce a
better error.

Should `iter` also be modified to produce a better error if `__iter__` is None?

Also, should this be documented? Maybe a sentence in the "Special method names" section of the "Data model" chapter, like this:

> To indicate that some syntax is not supported, set the corresponding special method name to None. For example, if __iter__ is None, the class is not iterable, so iter() will not look for __getitem__.

History
Date	User	Action	Args
2015-12-27 02:37:07	abarnert	set	recipients: + abarnert, gvanrossum, rhettinger, terry.reedy, r.david.murray, serhiy.storchaka, abarry, curioswati
2015-12-27 02:37:07	abarnert	set	messageid: <[email protected]>
2015-12-27 02:37:07	abarnert	link	issue25864 messages
2015-12-27 02:37:07	abarnert	create