[issue31966] print('hello\n', end='', flush=True) raises OSError when ran with py -u

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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components: +IO
nosy: +serhiy.storchaka

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31966>
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