.. highlightlang:: c

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 */
}

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