I think that documentation is wrong; AFAIK Py_UNICODE has always been allowed to be either 16 or 32 bits, and the source code goes through great lengths to make sure that you get a link error if you try to combine extensions built with different assumptions about its size.
On 5/3/05, Nicholas Bastin <[EMAIL PROTECTED]> wrote: > The documentation for Py_UNICODE states the following: > > "This type represents a 16-bit unsigned storage type which is used by > Python internally as basis for holding Unicode ordinals. On platforms > where wchar_t is available and also has 16-bits, Py_UNICODE is a > typedef alias for wchar_t to enhance native platform compatibility. On > all other platforms, Py_UNICODE is a typedef alias for unsigned > short." > > However, we have found this not to be true on at least certain RedHat > versions (maybe all, but I'm not willing to say that at this point). > pyconfig.h on these systems reports that PY_UNICODE_TYPE is wchar_t, > and PY_UNICODE_SIZE is 4. Needless to say, this isn't consistent with > the docs. It also creates quite a few problems when attempting to > interface Python with other libraries which produce unicode data. > > Is this a bug, or is this behaviour intended? > > It turns out that at some point in the past, this created problems for > tkinter as well, so someone just changed the internal unicode > representation in tkinter to be 4 bytes as well, rather than tracking > down the real source of the problem. > > Is PY_UNICODE_TYPE always going to be guaranteed to be 16 bits, or is > it dependent on your platform? (in which case we can give up now on > Python unicode compatibility with any other libraries). At the very > least, if we can't guarantee the internal representation, then the > PyUnicode_FromUnicode API needs to go away, and be replaced with > something capable of transcoding various unicode inputs into the > internal python representation. > > -- > Nick > > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > http://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > http://mail.python.org/mailman/options/python-dev/guido%40python.org > -- --Guido van Rossum (home page: http://www.python.org/~guido/) _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
