Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

The _mapping attribute is a private implementation detail and should remain 
undocumented.  A user of mapping views creates that attribute via the 
__init__() method.

In contrast, _from_iterable is explicitly meant to be overridden because it is 
the only way to control object creation.

Thank you for the suggestion.

----------
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37145>
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