[issue14386] Expose dictproxy as a public type

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

> A sequence *does* meet the (immutable) Mapping interface

Ah? Let's try:

>>> x=[1, 2, 3]
>>> x.get(2)
AttributeError: 'list' object has no attribute 'get'
>>> x.keys()
AttributeError: 'list' object has no attribute 'keys'

list doesn't implement the collections.abc.Mapping ABC.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14386>
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