Aaron Brady writes:
> I hold this is strong enough to put the burden of proof on the
> defenders of having 's'. What is its use case?
Passing the string to a C API that can't handle (or don't care about)
embedded null chars anyway. Filename API's are a typical example.
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Aaron Brady wrote:
>>> Otherwise you can't know its length or change its reference count.
>> The internal representation of Python byte strings is 0 terminated, so
>> strlen() will work.
>
> As MRAB said, Python strings can contain null bytes,
Sure, they can. Most byte strings I've seen didn't,
On Dec 18, 7:54 am, Stefan Behnel wrote:
> Aaron Brady wrote:
> > I see. Do I read correctly that 's' is only useful when the
> > argument's position is known?
>
> I assume you meant "length".
No, position in the argument list. Otherwise you can't change its
reference count; in which case, a po
On Dec 18, 6:43 am, Stefan Behnel wrote:
> Floris Bruynooghe wrote:
> > I'm slightly confused about some memory allocations in the C API.
>
> If you want to reduce the number of things you have to get your head
> around, learn Cython instead of the raw C-API. It's basically Python, does
> all the
Stefan Behnel wrote:
Aaron Brady wrote:
I see. Do I read correctly that 's' is only useful when the
argument's position is known?
I assume you meant "length".
Otherwise you can't know its length or
change its reference count.
The internal representation of Python byte strings is 0 termi
Aaron Brady wrote:
> I see. Do I read correctly that 's' is only useful when the
> argument's position is known?
I assume you meant "length".
> Otherwise you can't know its length or
> change its reference count.
The internal representation of Python byte strings is 0 terminated, so
strlen()
On Dec 18, 5:09 am, Ivan Illarionov wrote:
> On 18 ÄÅË, 03:51, Aaron Brady wrote:
> (snip)
>
> > How did you get a reference to the original
> > string object, with which to increment its reference count?
>
> Use the "O!" format instead of "s":
> PyObject *pystr;
> ... PyArg_ParseTuple(args, "O!
On 18 дек, 14:09, Ivan Illarionov wrote:
> ... PyArg_ParseTuple(args, "O!", &PyStringObject, &pystr) ...
Sorry, I must have said &PyString_Type, not &PyStringObject
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On 18 дек, 03:51, Aaron Brady wrote:
(snip)
> How did you get a reference to the original
> string object, with which to increment its reference count?
Use the "O!" format instead of "s":
PyObject *pystr;
... PyArg_ParseTuple(args, "O!", &PyStringObject, &pystr) ...
Then you can use PyString_AS
Floris Bruynooghe wrote:
> I'm slightly confused about some memory allocations in the C API.
If you want to reduce the number of things you have to get your head
around, learn Cython instead of the raw C-API. It's basically Python, does
all the reference counting for you and also reduces the amoun
En Wed, 17 Dec 2008 22:51:03 -0200, Aaron Brady
escribió:
On Dec 17, 6:42 pm, "Gabriel Genellina"
wrote:
En Wed, 17 Dec 2008 21:35:04 -0200, Floris Bruynooghe
escribió:
> But how can python now know how long to keep that buffer object in
> memory for?
It doesn't - *you* have to ensure
On Dec 17, 6:42 pm, "Gabriel Genellina"
wrote:
> En Wed, 17 Dec 2008 21:35:04 -0200, Floris Bruynooghe
> escribió:
> Yes; but you don't have to dig into the implementation; from
> http://docs.python.org/c-api/arg.html:
>
> s (string or Unicode object) [const char *]
> Convert a Python string
En Wed, 17 Dec 2008 21:35:04 -0200, Floris Bruynooghe
escribió:
On Dec 17, 11:06 pm, Floris Bruynooghe
wrote:
So I'm assuming PyArg_ParseTuple()
must allocate new memory for the returned string. However there is
nothing in the API that provides for freeing that allocated memory
again.
I'
Hello again
On Dec 17, 11:06 pm, Floris Bruynooghe
wrote:
> So I'm assuming PyArg_ParseTuple()
> must allocate new memory for the returned string. However there is
> nothing in the API that provides for freeing that allocated memory
> again.
I've dug a little deeper into this and found that PyA
Hi
I'm slightly confused about some memory allocations in the C API.
Take the first example in the documentation:
static PyObject *
spam_system(PyObject *self, PyObject *args)
{
const char *command;
int sts;
if (!PyArg_ParseTuple(args, "s", &command))
return NULL;
sts = s
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