So would this be better?
for k in d:
v = d[k]
# Do stuff with k and v
-Aaron
On Sat, Nov 15, 2008 at 1:53 PM, Robert Bradshaw
<[EMAIL PROTECTED]> wrote:
> On Nov 15, 2008, at 1:17 PM, Aaron DeVore wrote:
>
>> I'm trying to use PyDict_Next to iterate over a dict in a way that is
>> identical to this statement:
>> for k, v in d.items():
>> # do stuff with key and value
>>
>> PyDict_Next has the signature:
>> int PyDict_Next(PyObject *dictionary, Py_ssize_t *pos, PyObject **key,
>> PyObject **value)
>>
>>
>> The basic idea is that the dict uses pos to track which key it is on.
>> The key is then assigned to the key pointer and the corresponding
>> value is assigned to the value pointer. It can really help efficiency
>> because it doesn't involve iterators, tuples, etc.
>>
>> The most obvious code is the following:
>>
>> cdef int pos = 0
>> cdef object key, value
>> while PyDict_Next(d, &pos, &key, &value):
>> # do stuff with key and value
>>
>> However, apparently &python_object is not legal and I'm running into
>> odd type issues with &pos. Is there a way to get around those
>> limitations?
>
> Yes, declare them to be PyObject* rather than object. Then you'll
> have to do all refcounting manually (as you would have had to do
> anyways, as PyDict_Next doesn't decref its input). However, I doubt
> iterating over the dict manually like that will be a significant
> speed increase than the basic Python way of doing it.
>
> - Robert
>
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