[issue12568] Add functions to get the width in columns of a character

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> I'm -1 on using wcswidth, though.

When you write text into a console on Linux (e.g. displayed by gnome-terminal or konsole), I suppose that wcswidth() can be used to compute the width of a line. It would help to fix #2382.

Or do you think that wcswidth() gives the wrong result for this use case?

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