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Tip revision: 103e32355dc2a343f2847100662220cccbf9154c authored by Barry Warsaw on 29 September 2009, 22:41:09 UTC
Bumping for 2.6.3rc1
Bumping for 2.6.3rc1
Tip revision: 103e323
iter.rst
.. highlightlang:: c
.. _iterator:
Iterator Protocol
=================
.. versionadded:: 2.2
There are only a couple of functions specifically for working with iterators.
.. cfunction:: int PyIter_Check(PyObject *o)
Return true if the object *o* supports the iterator protocol.
.. cfunction:: PyObject* PyIter_Next(PyObject *o)
Return the next value from the iteration *o*. If the object is an iterator,
this retrieves the next value from the iteration, and returns *NULL* with no
exception set if there are no remaining items. If the object is not an
iterator, :exc:`TypeError` is raised, or if there is an error in 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 */
}