[issue1967] Backport dictviews to 2.7

[Thomas Grainger]

Thomas Grainger <tagrain at gmail.com> added the comment:

It seems that 'viewkeys', 'viewvalues' and 'viewitems' methods were not added to types.DictProxyType, was that intentional?

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nosy: +graingert

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue1967>
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