[issue21497] faulthandler should handle sys.stderr being None gracefully

[STINNER Victor]

STINNER Victor added the comment:

> This means there's an unexpected gotcha

I prefer to see an exception before sys.stderr is None, instead of not seeing the traceback when the application does crash. It is usually a pain to reproduce a crash in the exact same conditions.

> if I want my application to still run under Windows when the user has changed the default, I first have to check sys.stderr before enabling faulthandler.

Exactly. It's not really specific to Windows, you may also have sys.stderr on UNIX in some cases.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21497>
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