[issue21677] Exception context set to string by BufferedWriter.close()

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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nosy: +benjamin.peterson, pitrou, serhiy.storchaka, stutzbach

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21677>
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