[Python-Dev] Reintroduce or drop completly hex, bz2, rot13, ... codecs (original) (raw)
Nick Coghlan ncoghlan at gmail.com
Wed Jun 9 14:47:22 CEST 2010
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On 09/06/10 22:18, Victor Stinner wrote:
Le mercredi 09 juin 2010 10:41:29, M.-A. Lemburg a écrit :
No, .transform() and .untransform() will be interface to same-type codecs, i.e. ones that convert bytes to bytes or str to str. As with .encode()/.decode() these helper methods also implement type safety of the return type. What about buffer compatible objects like array.array(), memoryview(), etc.? Should we use codecs.encode() / codecs.decode() for these types?
There are probably enough subtleties that this is all worth specifying in a PEP:
- which codecs from 2.x are to be restored
- the domain each codec operates in (binary data or text)*
- review behaviour of codecs.encode and codecs.decode
- behaviour of the new str, bytes and bytearray (un)transform methods
- whether to add helper methods for reverse codecs (like base64)
The PEP would also serve as a reference back to both this discussion and the previous one (which was long enough ago that I've forgotten most of it).
*Some are obvious, such as rot13 being text only, and bz2 being binary data only, but others are less clear. hex could be either str->str or bytes->bytes, since ''.join(map(chr, seq)) and b''.join(map(ord, seq)) allow each of them to be implemented trivially in terms of the other. As Antoine pointed out, base64 is really a reverse codec (encode from bytes->str, decode from str->bytes), so it still wouldn't be covered by the new transformation helper methods.
Cheers, Nick.
-- Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia
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