Message 399924 - Python tracker

Message399924

Author	serhiy.storchaka
Recipients	BvB93, JelleZijlstra, farcat, gvanrossum, kj, lars2, lukasz.langa, miss-islington, pablogsal, serhiy.storchaka, uriyyo
Date	2021-08-19.16:36:15
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1629390975.21.0.201680278713.issue44524@roundup.psfhosted.org>
In-reply-to

Content
There are some side effects of setting _name. In 3.9: >>> class X(Annotated[int, (1, 10)]): pass ... >>> X.__mro__ (<class '__main__.X'>, <class 'int'>, <class 'object'>) In 3.10: >>> class X(Annotated[int, (1, 10)]): pass ... >>> X.__mro__ (<class '__main__.X'>, <class 'int'>, <class 'typing.Generic'>, <class 'object'>) Now a subclass of an Annotated alias is a generic type. Should it be?

Content

There are some side effects of setting _name. In 3.9:

>>> class X(Annotated[int, (1, 10)]): pass
... 
>>> X.__mro__
(<class '__main__.X'>, <class 'int'>, <class 'object'>)

In 3.10:

>>> class X(Annotated[int, (1, 10)]): pass
... 
>>> X.__mro__
(<class '__main__.X'>, <class 'int'>, <class 'typing.Generic'>, <class 'object'>)

Now a subclass of an Annotated alias is a generic type. Should it be?

History
Date	User	Action	Args
2021-08-19 16:36:15	serhiy.storchaka	set	recipients: + serhiy.storchaka, gvanrossum, farcat, lukasz.langa, JelleZijlstra, pablogsal, miss-islington, uriyyo, BvB93, kj, lars2
2021-08-19 16:36:15	serhiy.storchaka	set	messageid: <1629390975.21.0.201680278713.issue44524@roundup.psfhosted.org>
2021-08-19 16:36:15	serhiy.storchaka	link	issue44524 messages
2021-08-19 16:36:15	serhiy.storchaka	create