[issue6697] Python 3.1 segfaults when invalid UTF-8 characters are passed from command line

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

The %U format seems adequate for this purpose - actually
PyObject_GenericSetAttr uses it already.

Yes, the exception message will contain the same lone UTF-8
surrogates; this is not a problem because sys.stderr uses the
"backslashreplace" error handler.

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<http://bugs.python.org/issue6697>
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