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Thu Jun 5 00:54:42 CEST 2014 · https://mail.python.org/pipermail/python-dev/2014-June/134787.html

05.06.14 00:21, Terry Reedy написав(ла):
> On 6/4/2014 3:41 AM, Jeff Allen wrote:
>> Jython uses UTF-16 internally -- probably the only sensible choice in a
>> Python that can call Java. Indexing is O(N), fundamentally. By
>> "fundamentally", I mean for those strings that have not yet noticed that
>> they contain no supplementary (>0xffff) characters.
>
> Indexing can be made O(log(k)) where k is the number of astral chars,
> and is usually small.

I like your idea and think it would be great if Jython will implement 
it. Unfortunately it is too late to do this in CPython.

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[Python-Dev] Internal representation of strings and Micropython