[issue17331] Fix str methods for detecting digits with unicode

[R. David Murray]

R. David Murray added the comment:

I think this is working as designed, and can't be changed (at least not easily) because of backward compatibility even if there are bits of the design that are deemed buggy.  The issue, I believe, is what is considered a number by the Unicode consortium.

See issue 10557 for some background.

Python should at least be consistent about what is treated as a number, though, so the ugly syntax error from namedtuple is probably a bug.

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nosy: +eric.smith, lemburg, mark.dickinson, r.david.murray, rhettinger

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<http://bugs.python.org/issue17331>
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