poq <p...@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, ...

----------
nosy: +poq

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