Find function name in function

[Erik Max Francis]

Gerrit Holl wrote:

> I think backuping sys.stdout is not necessary, as sys.__stdout__
> exists for that goal.

If this is intended to act as a standalone script, you of course have a
point.  If it's a library function, though, sys.stdout may have already
been overridden at some point and you may want to be safe.

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