[issue2408] types should expose cell object

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

While I'm at it, the _types module could be removed, because its exports
can easily be replaced by:

GetSetDescriptorType = type(Exception.args)
MemberDescriptorType = type(EnvironmentError.errno)

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Tracker <report at bugs.python.org>
<http://bugs.python.org/issue2408>
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