On 05/17/2013 08:46 PM, Steven D'Aprano wrote:
On 18/05/13 05:23, Albert-Jan Roskam wrote:
Hi,
I was curious what the "high" four-byte ut8 unicode characters look like.
What typeface are you using to print them? Most type faces ("fonts")
only support a tiny portion of the Unicode range. For that matter, most
of the Unicode range is currently unused.
Why does the snippet below not print anything (well, it will
eventually, I think, but at that point I have lost my patience
already). Puh-lease tell me there are no such things as Mongolian,
Chinese backspaces and other nonprintable characters. ;-)
Chinese backspaces? Probably not. But there may well be unprintable
characters for all sorts of reasons:
- the font you are using simply doesn't have a glyph for the code-point;
- the code-point is not yet assigned, so there's nothing to show;
- the code-point represents an invisible character, like IDEOGRAPHIC
SPACE, or a zero-width character, like MONGOLIAN VOWEL SEPARATOR;
- or it represents a non-printing control character;
- or a formatting mark like LEFT-TO-RIGHT EMBEDDING;
- or it is one of the sixty-six guaranteed "non-characters", such as the
infamous byte-order marks U+FFFE and U+FFFF.
One tool that can help is the name function in module unicodedata
>>> import unicodedata
>>> unicodedata.name(u'\xb0')
'DEGREE SIGN'
If you try that on the values near sys.maxunicode you get an exception:
ValueError: no such name
For example:
>>> unicodedata.name(unichr(sys.maxunicode - 1))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: no such name
--
DaveA
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