Stefan Behnel added the comment:
Nice one. While reimplementing it for Cython, I noticed that the grammar
described in the PEP isn't exactly as it's implemented, though. The grammar says
digit (["_"] digit)*
whereas the latest patch (v4) says
`digit` (`digit` | "_")*
and also implements it that way. The former doesn't allow underscores at the
end of a literal.
And the regexes in tokenize.py seem happy to accept "0x___", for example. Is
that intended?
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nosy: +scoder
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<http://bugs.python.org/issue26331>
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