Raymond Hettinger added the comment: In putting together a patch for this, I noticed that the __subclasshook__ classmethods don't compose well. I'm unclear about the semantics about what these hooks are supposed to mean for subclasses and whether there is a bug in the existing code for Set, Sequence, and Mapping. Each of those inherits from Sized, Iterable, and Container, but only the Sized.__subclasshook__ is visible to the subclass. Also, the code for Sized.__subclasshook__ has an identity check for Sized which doesn't seem correct from the point-of-view of the subclasses.
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