[issue43443] Should shelve support dict union?

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

The comment is outdated. Shelf objects also do not support methods copy and fromkey. Creating a new Shelve object without specifying a new underlying database object does not make much sense.

Maybe say that they implement the MutableMapping interface?

>>> sorted(set(dir(dict)) - set(dir(shelve.Shelf)))
['__ior__', '__or__', '__ror__', 'copy', 'fromkeys']
>>> sorted(set(dir(collections.abc.MutableMapping)) - set(dir(shelve.Shelf)))
[]

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nosy: +rhettinger, serhiy.storchaka

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<https://bugs.python.org/issue43443>
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