Marc-Andre Lemburg <[email protected]> added the comment:
Antoine Pitrou wrote:
>
> Antoine Pitrou <[email protected]> added the comment:
>
>> Any Python object can expose a buffer interface and the above
>> functions then allow accessing these interfaces from within
>> Python.
>
> What's the point? The codecs functions already support objects exposing the
> buffer interface:
>
>>>> b = b"\xe9"
>>>> codecs.latin_1_decode(memoryview(b))
> ('é', 1)
>>>> codecs.latin_1_decode(array.array("b", b))
> ('é', 1)
>
> Those two functions are undocumented. They serve no useful purpose (you can
> call the bytes(...) constructor instead, or even use the buffer object
> directly as showed above). They are badly named since they don't have
> anything to do with codecs. Google Code Search shows them not appearing
> anywhere else than implementations of the Python stdlib. Removing them only
> seems reasonable.
readbuffer_encode and charbuffer_encode convert objects to bytes
and provide a codec encoder interface for this, hence the naming.
They are meant to be used as encode methods for codecs, just like
the other *_encode functions exposed in the _codecs module, e.g.
class BinaryDataCodec(codecs.Codec):
# Note: Binding these as C functions will result in the class not
# converting them to methods. This is intended.
encode = codecs.readbuffer_encode
decode = codecs.latin_1_decode
While it's possible to emulate the functions via other methods,
these methods always introduce intermediate objects, which isn't
necessary and only costs performance.
Given than "t#" was basically rendered useless in Python3 (see
issue8839), removing charbuffer_encode() is indeed possible,
so
+1 on removing charbuffer_encode()
-1 on removing readbuffer_encode()
----------
title: Remove codecs.readbuffer_encode() and codecs.charbuffer_encode() ->
Remove codecs.readbuffer_encode() and codecs.charbuffer_encode()
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<http://bugs.python.org/issue8838>
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