> I still like this proposal. I don't quite understand the competing (?) > proposal by Stephen Turnbull; perhaps Stephen can compare and contrast > the two proposals? And where does Atsuo fall?
IIUC, Stephen proposes to use some of the "security" algorithms for display, without (yet) specifying which one specifically. I don't think they apply, as these algorithms are designed for identifiers (in particular for use in programming languages and domain names); any character classified as "confusing" would get escaped. As Stephen elaborates, that would have the undesirable side effect of escaping the Cyrillic A (i.e. А), likewise for some Greek letters. In any case, one would have to write a precise specification first (UTR#36/#39 leave options), and probably extend the tables in unicodedata. Atsuo's latest proposal (http://wiki.python.org/moin/Python3kStringRepr) is an elaboration of mine, I think. I would have phrased it slightly differently, i.e. - escaped are all Z* and C* characters, plus backslash, except space. In UCS-2 builds, half surrogates get escaped only if they don't occur as a pair. - escaping looks like this: * \r, \n, \t, \\ * \xXX for characters from Latin-1 * \uXXXX for characters from the BMP * \U00XXXXXX for anything else What I didn't have in my original proposal was escaping of Zs except for space, which then would also escape NBSP, EN QUAD, EM QUAD, THIN SPACE, HAIR SPACE, OGHAM SPACE MARK, etc. Escaping them is fine also. Also, I didn't consider surrogate pairs in UCS-2 builds originally; they should (of course) get represented as-is. The issue then is output of repr to a device, which may go wrong in two ways: - the device claims it supports the character, but doesn't actually have a glyph for it. In that case, the terminal encoding should be adjusted. - the device cannot display certain characters in the repr. Here, an escaping error handler can be used if desired. Regards, Martin _______________________________________________ Python-3000 mailing list Python-3000@python.org http://mail.python.org/mailman/listinfo/python-3000 Unsubscribe: http://mail.python.org/mailman/options/python-3000/archive%40mail-archive.com
