[issue14386] Expose dictproxy as a public type

[STINNER Victor]

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

"It is exposed as types.DictProxyType in Python 2..."

Yes, but the purpose of the issue is to enable its constructor. You cannot instanciate a DictProxy in Python 2:

>>> import types
>>> types.DictProxyType
<type 'dictproxy'>
>>> types.DictProxyType({})
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: cannot create 'dictproxy' instances

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