Message 409296 - Python tracker

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Author	serhiy.storchaka
Recipients	AlexWaygood, Dutcho, enedil, gvanrossum, iritkatriel, levkivskyi, lukasz.langa, rhettinger, selik, serhiy.storchaka, techdragon
Date	2021-12-29.08:29:23
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1640766563.31.0.0273331417877.issue34498@roundup.psfhosted.org>
In-reply-to

Content
The original issue is about dispatching on non-parametrized generics like typing.Sequence. isinstance([], typing.Sequence) works, so it could be possible to support dispatching on typing.Sequence. But I have doubts that it is worth to revive such feature, because it needs some effort, and you can use collections.abc.Sequence instead. But there is a conflict between using annotations in singledispatch() and MyPy (issue46191).

The original issue is about dispatching on non-parametrized generics like typing.Sequence. isinstance([], typing.Sequence) works, so it could be possible to support dispatching on typing.Sequence. But I have doubts that it is worth to revive such feature, because it needs some effort, and you can use collections.abc.Sequence instead.

But there is a conflict between using annotations in singledispatch() and MyPy (issue46191).

History
Date	User	Action	Args
2021-12-29 08:29:23	serhiy.storchaka	set	recipients: + serhiy.storchaka, gvanrossum, rhettinger, lukasz.langa, techdragon, levkivskyi, selik, Dutcho, enedil, iritkatriel, AlexWaygood
2021-12-29 08:29:23	serhiy.storchaka	set	messageid: <1640766563.31.0.0273331417877.issue34498@roundup.psfhosted.org>
2021-12-29 08:29:23	serhiy.storchaka	link	issue34498 messages
2021-12-29 08:29:23	serhiy.storchaka	create