[Python-Dev] cStringIO buffer interface
exarkun at divmod.com
Wed Apr 30 20:38:04 CEST 2008
On Wed, 30 Apr 2008 09:51:25 -0700, Guido van Rossum <guido at python.org> wrote:
>On Wed, Apr 30, 2008 at 9:36 AM, Farshid Lashkari <flashk at gmail.com> wrote:
>> I was just curious as to why cStringIO objects don't implement the
>> buffer interface. cStringIO objects seem similar to string and array
>> objects, and those support the buffer protocol. Is there a reason
>> against allowing cStringIO to support at least the read buffer
>> interface, or is just that nobody has considered it until now?
>Well, for one, it would mean you could no longer exchange a StringIO
>instance for a cStringIO instance.
It would probably only mean that there is one further incompatibility
between cStringIO and StringIO - you already can't exchange them in a
number of cases. They handle unicode differently, they have different
Maybe making them diverge even further is a step in the wrong direction,
>Also, what's the compelling use case you're thinking of?
I'm not sure what use-case Farshid Lashkari had. For Twisted, it has
been considered as a way to reduce peak memory usage (by reducing the
need for memory copying, which also speeds things up). I'm not sure
if anyone has benchmarked this yet, so I don't know if it's a real win
or not. I think Thomas Hervé has a patch to cStringIO which implements
the feature, though.
For reference, <http://twistedmatrix.com/trac/ticket/3188>.
This isn't high on my priority list, but I thought I'd point out the
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