blob: 63290e0a7f0bf7e6ab4a1548c2e7cdb64ee1640b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
.. highlight:: c
.. _iterator:
Iterator Protocol
=================
There are two functions specifically for working with iterators.
.. c:function:: int PyIter_Check(PyObject *o)
Return non-zero if the object *o* supports the iterator protocol, and ``0``
otherwise. This function always succeeds.
.. c:function:: int PyAiter_Check(PyObject *o)
Returns non-zero if the object 'obj' provides :class:`AsyncIterator`
protocols, and ``0`` otherwise. This function always succeeds.
.. versionadded:: 3.10
.. c:function:: PyObject* PyIter_Next(PyObject *o)
Return the next value from the iteration *o*. The object must be an iterator
(it is up to the caller to check this). If there are no remaining values,
returns ``NULL`` with no exception set. If an error occurs while retrieving
the item, returns ``NULL`` and passes along the exception.
To write a loop which iterates over an iterator, the C code should look
something like this::
PyObject *iterator = PyObject_GetIter(obj);
PyObject *item;
if (iterator == NULL) {
/* propagate error */
}
while ((item = PyIter_Next(iterator))) {
/* do something with item */
...
/* release reference when done */
Py_DECREF(item);
}
Py_DECREF(iterator);
if (PyErr_Occurred()) {
/* propagate error */
}
else {
/* continue doing useful work */
}
.. c:type:: PySendResult
The enum value used to represent different results of :c:func:`PyIter_Send`.
.. versionadded:: 3.10
.. c:function:: PySendResult PyIter_Send(PyObject *iter, PyObject *arg, PyObject **presult)
Sends the *arg* value into the iterator *iter*. Returns:
- ``PYGEN_RETURN`` if iterator returns. Return value is returned via *presult*.
- ``PYGEN_NEXT`` if iterator yields. Yielded value is returned via *presult*.
- ``PYGEN_ERROR`` if iterator has raised and exception. *presult* is set to ``NULL``.
.. versionadded:: 3.10
|
