[issue25326] Improve error message for "character buffer objects"

[Roundup Robot]

Roundup Robot added the comment:

New changeset 4d1bd86d3bbd by Raymond Hettinger in branch '2.7':
Issue #25326:  Improve an obscure error message.
https://hg.python.org/cpython/rev/4d1bd86d3bbd

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nosy: +python-dev

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<http://bugs.python.org/issue25326>
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