Le mardi 9 juillet 2013 09:00:02 UTC+2, Steven D'Aprano a écrit :
> On Mon, 08 Jul 2013 10:53:18 -0700, ferdy.blatsco wrote:
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> > Not using python 3, for me (a programmer which was present at the
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> > beginning of computer science, badly interacting with many languages
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> > from assembler to Fortran and from c to Pascal and so on) it was an hard
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> > job to arrange the abrupt transition from characters only equal to bytes
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> Characters have *never* been equal to bytes. Not even Perl treats the
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> character 'A' as equal to the byte 0x0A:
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> if (0x0A eq 'A') {print "Equal\n";}
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> else {print "Unequal\n";}
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> will print Unequal, even if you replace "eq" with "==". Nor does Perl
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> consider the character 'A' equal to 65.
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> If you have learned to think of characters being equal to bytes, you have
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> learned wrong.
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> > to some special characters defined with 2, 3 bytes and even more. I
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> > should have preferred another solution... but i'm not Guido....!
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> What's a special character?
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> To an Italian, the characters J, K, W, X and Y are "special characters"
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> which do not exist in the ordinary alphabet. To a German, they are not
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> special, but S is special because you write SS as ß, but only in
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> lowercase.
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> To a mathematician, σ is just as ordinary as it would be to a Greek; but
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> the mathematician probably won't recognise ς unless she actually is
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> Greek, even though they are the same letter.
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> To an American electrician, Ω is an ordinary character, but ω isn't.
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> To anyone working with angles, or temperatures, the degree symbol ° is an
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> ordinary character, but the radian symbol is not. (I can't even find it.)
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> The English have forgotten that W used to be a ligature for VV, and
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> consider it a single ordinary character. But the ligature Æ is considered
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> an old-fashioned way of writing AE.
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> But to Danes and Norwegians, Æ is an ordinary letter, as distinct from AE
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> as TH is from Þ. (Which English used to have.) And so on...
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> I don't know what a special character is, unless it is the ASCII NUL
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> character, since that terminates C strings.
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The concept of "special characters" does not exist.
However, the definition of a "character" is a problem
per se (character, glyph, grapheme, ...).
You are confusing Unicode, typography and linguistic.
There is no symbole for radian because mathematically
radian is a pure number, a unitless number. You can
hower sepecify a = ... in radian (rad).
Note the difference between SS and ẞ
'FRANZ-JOSEF-STRAUSS-STRAẞE'
jmf
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