[Python-3000] PEP 3131 accepted
python at zesty.ca
Thu May 24 00:02:01 CEST 2007
On Wed, 23 May 2007, Ka-Ping Yee wrote:
> So there are three sets of characters that look the same:
> U+02BB = U+0312 = U+2018
> U+02BC = U+0313 = U+0315 = U+2019
> U+02EE = U+201D
The Greek combining koronis, U+0343, is an allowed identifier
character and also looks identical to a single right quote,
U+02BC = U+0313 = U+0315 = U+0343 = U+2019.
> U+0312, U+0313, and U+0315 are combining characters that cause the
> comma to appear over the preceding letter, and they are not allowed
> to appear as the first character in an identifier. So, if your
> editor displays combining characters as properly combined, they will
> not be confusable with quotation marks; otherwise, they could be.
I just realized that this is not the whole story. There's no
requirement that a combining character has to actually come
after a character it can be combined with. So there might be
valid identifiers containing sequences of characters that don't
have a sensible rendering, or that force the combining comma to
appear separately and thus indistinguishable from a quotation
mark even in a Unicode-aware editor.
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