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

[Raymond Hettinger]

New submission from Raymond Hettinger:

Python 2.7.10+ (2.7:fc6d62db8d42+, Oct  6 2015, 11:55:10) 
[GCC 4.2.1 Compatible Apple LLVM 7.0.0 (clang-700.0.72)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> s = 'the tale of two cities'
>>> s.count(('a', 'z'))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: expected a character buffer object (such as a string)

   new text ---------------------------------^^^^^^^^^^^^^^^^^^^

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25326>
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