Marc-Andre Lemburg <m...@egenix.com> added the comment: STINNER Victor wrote: > > STINNER Victor <victor.stin...@haypocalc.com> added the comment: > >> Those two encoder functions were meant to be used by Python codec >> implementations which want to use the readbuffer and charbuffer >> interfaces available in Python via "s#" and "t#" to access input >> object data. > > Ah ok. > >> They are not used by the builtin codecs, >> but may well be in use by 3rd party codecs. > > My quick Google search didn't found any of those. I suppose that str and > bytes are enough for most people. Do you know an usecase of text or bytes > stored in different types than str and bytes? (I suppose the bytearray is > compatible with bytes, and so it can be used instead of bytes)
Any Python object can expose a buffer interface and the above functions then allow accessing these interfaces from within Python. Think of e.g. memory mapped files, image/audio/video objects, database BLOBs, scientific data types, numeric arrays, etc. There are lots of such object types. >> I'm not sure why you think those functions are not encoders. > > I consider that Python3 codecs module only encode and decode text to/from an > encoding, whereas Python2 had extra unrelated codecs like "base64" or "hex" > (but it was decided to remove them to cleanup the codecs module). Those codecs will be reenabled in Python 3.2. Removing them was a mistake. The codec machinery is not limited to only working on Unicode and bytes. It can work on arbitrary type combinations, depending on what a codec wants to implement. ---------- title: Remove codecs.readbuffer_encode() and codecs.charbuffer_encode() -> Remove codecs.readbuffer_encode() and codecs.charbuffer_encode() _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue8838> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
