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v0.8.1
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Tip revision: bf9cccb2b54ad2c641ea78435a8618a6d251491e authored by Ned Deily on 19 September 2017, 08:31:30 UTC
post 3.3.7, should there be any
post 3.3.7, should there be any
Tip revision: bf9cccb
iter.rst
.. highlightlang:: c
.. _iterator:
Iterator Protocol
=================
There are two functions specifically for working with iterators.
.. c:function:: int PyIter_Check(PyObject *o)
Return true if the object *o* supports the iterator protocol.
.. 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 */
}