[issue31232] Backport the new custom "print >> sys.stderr" error message?

[Barry A. Warsaw]

Barry A. Warsaw added the comment:

It's probably fine, since it should be a rare occurrence, but it of course has the potential to break things like tests (doc and otherwise).  Unlikely, but it should be pointed out.  Still, I'm also fine with backporting it.

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nosy: +barry

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<http://bugs.python.org/issue31232>
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