[issue40890] Dict views should be introspectable

[Dennis Sweeney]

Dennis Sweeney <sweeney.dennis650 at gmail.com> added the comment:

I'd be happy to write a PR.

Method names could be "mapping", "target", "target_mapping", "target_dict", "referent_dict", etc. 

I like the choice of "target_mapping":

    d = dict()
    assert d is d.keys().target_mapping
    assert d is d.values().target_mapping
    assert d is d.items().target_mapping

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nosy: +Dennis Sweeney

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<https://bugs.python.org/issue40890>
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