New in version 2.2.
There are only a couple of functions specifically for working with iterators.
| PyObject *o) | 
| PyObject *o) | 
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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