[issue12753] \N{...} neglects formal aliases and named sequences from Unicode charnames namespace

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

Leaving named sequences for unicodedata.lookup() only (and not for \N{}) makes sense.

The list of aliases is so small (11 entries) that I'm not sure using a binary search for it would bring any advantage.  Having a single lookup algorithm that looks in both tables doesn't work because the aliases lookup must be in _getcode for \N{...} to work, whereas the lookup of named sequences will happen in unicodedata_lookup (Modules/unicodedata.c:1187).
I think we can leave the for loop over aliases in _getcode and implement a separate (and binary) search in unicodedata_lookup for the named sequences.  Does that sound fine?

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<http://bugs.python.org/issue12753>
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