[issue13601] sys.stderr should be line-buffered when stderr is not a TTY

[Jendrik Seipp]

Jendrik Seipp <jendrikseipp at gmail.com> added the comment:

I took the liberty of increasing the target version. It would be great if someone could review my patch for this issue at https://github.com/python/cpython/pull/17646 .

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nosy: +jendrik
versions: +Python 3.9 -Python 3.7

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