[issue40890] Dict views should be introspectable

[Dennis Sweeney]

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

PR 20749 gives each dict view access to a mappingproxy for the original dict, although I don't know if that defeats the original purpose.

It might be hard to sensibly make MappingProxy(d).items() return something other than d.items(), since this is already the behavior for user-defined classes:

>>> class A:
    def __getitem__(self, key):
        return "value"
    def items(self):
        return 17

>>> from types import MappingProxyType
>>> MappingProxyType(A()).items()
17

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