poq <p...@gmx.com> added the comment:

Martin,

I agree that wcswidth is incorrect with respect to Unicode. However I don't 
think that's relevant at all. Python should only try to match the behaviour of 
the terminal.

Since terminals do slightly different things, trying to match them exactly - in 
all cases, on all systems - is virtually impossible. But AFAICT wcwidth should 
match the terminal behaviour on nearly all modern systems, so it makes sense to 
expose it.

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<http://bugs.python.org/issue12568>
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