[issue17275] io.BufferedWriter shows wrong type in argument error message

[R. David Murray]

R. David Murray added the comment:

That would be great.  Use assertRaisesRegex and check that the correct name is in the message string.

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nosy: +pitrou, r.david.murray
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17275>
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