Raymond Hettinger added the comment:

I'll follow David Murray's suggestion here.  The glossary definition of 
iterable is already very good, it just needs to clarify that the __getitem__() 
method needs to implement sequence semantics.  Anything further is beyond the 
scope of a glossary entry.

Also, I'll amend the docs on collections.abc.Iterable() to be more specific 
about what it is does and doesn't recognize.

FWIW, the topic is also discussed in other places:

* https://docs.python.org/3/library/functions.html#iter
* https://docs.python.org/3/reference/datamodel.html#object.__getitem__
* https://docs.python.org/3/reference/datamodel.html#object.__iter__

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<https://bugs.python.org/issue18558>
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