[issue13601] sys.stderr should always be line-buffered

[Nick Coghlan]

Nick Coghlan added the comment:

This question came up today in the context of the final line of a traceback output potentially being missing from stderr if the closing flush of the standard streams is missed for any reason.

That's not going to be a common scenario (as far as I know it was an entirely hypothetical discussion), but the last line of a traceback is the one with the actual error message, so it's likely to be annoyingly cryptic if it does happen.

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nosy: +ncoghlan

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<http://bugs.python.org/issue13601>
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