[issue23401] Add pickle support of Mapping views

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Oh, and yet one option:

5) As a list or a tuple. `copyreg.__newobj__, (list,), None, iter(self._mapping.keys())` or `copyreg.__newobj__, (tuple, tuple(self._mapping))`.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23401>
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