[issue35190] collections.abc.Sequence cannot be used to test whether a class provides a particular interface (doc issue)

Josh Rosenberg added the comment: Wait, why should #25737 be closed? This bug is a docs issue; collections.abc shouldn't claim that all the ABCs do duck-typing checks since Sequence doesn't. But #25737 is specific: array.array *should* be registered as a Sequence, but isn't; that requires a

[issue35190] collections.abc.Sequence cannot be used to test whether a class provides a particular interface (doc issue)

Cheryl Sabella added the comment: The previous comment is a self-reference. I believe the intention was to mark this as a duplicate of #17561. -- nosy: +cheryl.sabella ___ Python tracker

[issue35190] collections.abc.Sequence cannot be used to test whether a class provides a particular interface (doc issue)

Change by Cheryl Sabella : -- Removed message: https://bugs.python.org/msg335533 ___ Python tracker ___ ___ Python-bugs-list

[issue35190] collections.abc.Sequence cannot be used to test whether a class provides a particular interface (doc issue)

Ivan Levkivskyi added the comment: I would propose to keep this one open as a superseding https://bugs.python.org/issue23864 and close the latter (assuming we are not going to make all classes protocols, we I think we really shouldn't, and instead we should improve the docs). --

[issue35190] collections.abc.Sequence cannot be used to test whether a class provides a particular interface (doc issue)

Serhiy Storchaka added the comment: This looks like a duplicate of issue23864 and issue25737. -- ___ Python tracker ___ ___

[issue35190] collections.abc.Sequence cannot be used to test whether a class provides a particular interface (doc issue)

Change by STINNER Victor : -- title: collections.abc.Sequence cannot be used to test whether a class provides a particular interface -> collections.abc.Sequence cannot be used to test whether a class provides a particular interface (doc issue) ___

[issue35190] collections.abc.Sequence cannot be used to test whether a class provides a particular interface

Ivan Levkivskyi added the comment: The separation may look arbitrary, but the idea is quite simple. Only those classes with few methods support structural checks. Those classes have few independent abstract methods (or even just one method), while in classes with large APIs like `Sequence`,

[issue35190] collections.abc.Sequence cannot be used to test whether a class provides a particular interface

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[issue35190] collections.abc.Sequence cannot be used to test whether a class provides a particular interface

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[issue35190] collections.abc.Sequence cannot be used to test whether a class provides a particular interface

Miro Hrončok added the comment: I fail to understand what abc classes can be used to test whether a class provides a particular interface, and what abc classes cannot be used that way. What is the difference between those abc classes and why are all those abc classes listed together when

[issue35190] collections.abc.Sequence cannot be used to test whether a class provides a particular interface

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[issue35190] collections.abc.Sequence cannot be used to test whether a class provides a particular interface

Guido van Rossum added the comment: Yeah, the docs need to be clarified. -- ___ Python tracker ___ ___ Python-bugs-list mailing

[issue35190] collections.abc.Sequence cannot be used to test whether a class provides a particular interface

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[issue35190] collections.abc.Sequence cannot be used to test whether a class provides a particular interface

New submission from Miro Hrončok : The collections.abc — Abstract Base Classes for Containers documentation says: > This module provides abstract base classes that can be used to test whether a > class provides a particular interface; for example, whether it is hashable or > whether it is a