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

[poq]

poq <poq at gmx.com> added the comment:

Martin, I think you meant to write "if w == 'A':".
Some very common characters have ambiguous widths though (e.g. the Greek alphabet), so you can't just raise an error for them.

http://unicode.org/reports/tr11/ says:
"Ambiguous characters occur in East Asian legacy character sets as wide characters, but as narrow (i.e., normal-width) characters in non-East Asian usage."

So in practice applications can treat ambiguous characters as narrow by default, with a user setting to use legacy (wide) width.

As Tom pointed out there are also a bunch of zero width characters, and characters with special formatting like tab, soft hyphen, ...

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nosy: +poq

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