[docs] [issue26557] dictviews methods not present on shelve objects

[Thomi Richards]

Thomi Richards added the comment:

Attached is a patch that adds a sentence to the UserDict module docs explicitly stating that the viewkeys, viewitems, and viewvalues functions are not implemented. I don't think it's worth adding support for these newer functions in UserDict. I'm unsure whether landing this patch is as necessary as the patch for the shelve module.

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Added file: http://bugs.python.org/file44580/issue26557_userdict.patch

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