2008/9/10 Amaury Forgeot d'Arc <report@bugs.python.org>:
> Code point 0x0370 is now a printable character.
> r66381 corrected the failures by simply changing it to 0x0378, until the
> next unicodedata upgrade...
> I wonder if there is a value that is guaranteed to stay non-printable.

The control characters?

--
--Guido van Rossum (home page: http://www.python.org/~guido/)