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.. highlightlang:: c

.. _iterator:

Iterator Protocol
=================

.. versionadded:: 2.2

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.

   This function can return a false positive in the case of old-style
   classes because those classes always define a :c:member:`tp_iternext`
   slot with logic that either invokes a :meth:`next` method or raises
   a :exc:`TypeError`.

.. 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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