[issue21310] ResourceWarning when open() fails with io.UnsupportedOperation: File or stream is not seekable

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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nosy: +haypo, pitrou, serhiy.storchaka
type:  -> behavior

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21310>
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