mirror of
https://github.com/python/cpython.git
synced 2024-11-24 08:52:25 +01:00
e006c7371d
Return -1 and set an exception on error; return 0 if the iterator is exhausted, and return 1 if the next item was fetched successfully. Prefer this API to PyIter_Next(), which requires the caller to use PyErr_Occurred() to differentiate between iterator exhaustion and errors. Co-authered-by: Irit Katriel <iritkatriel@yahoo.com>
60 lines
2.0 KiB
ReStructuredText
60 lines
2.0 KiB
ReStructuredText
.. highlight:: c
|
|
|
|
.. _iterator:
|
|
|
|
Iterator Protocol
|
|
=================
|
|
|
|
There are two functions specifically for working with iterators.
|
|
|
|
.. c:function:: int PyIter_Check(PyObject *o)
|
|
|
|
Return non-zero if the object *o* can be safely passed to
|
|
:c:func:`PyIter_NextItem` and ``0`` otherwise.
|
|
This function always succeeds.
|
|
|
|
.. c:function:: int PyAIter_Check(PyObject *o)
|
|
|
|
Return non-zero if the object *o* provides the :class:`AsyncIterator`
|
|
protocol, and ``0`` otherwise. This function always succeeds.
|
|
|
|
.. versionadded:: 3.10
|
|
|
|
.. c:function:: int PyIter_NextItem(PyObject *iter, PyObject **item)
|
|
|
|
Return ``1`` and set *item* to a :term:`strong reference` of the
|
|
next value of the iterator *iter* on success.
|
|
Return ``0`` and set *item* to ``NULL`` if there are no remaining values.
|
|
Return ``-1``, set *item* to ``NULL`` and set an exception on error.
|
|
|
|
.. versionadded:: 3.14
|
|
|
|
.. c:function:: PyObject* PyIter_Next(PyObject *o)
|
|
|
|
This is an older version of :c:func:`!PyIter_NextItem`,
|
|
which is retained for backwards compatibility.
|
|
Prefer :c:func:`PyIter_NextItem`.
|
|
|
|
Return the next value from the iterator *o*. The object must be an iterator
|
|
according to :c:func:`PyIter_Check` (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.
|
|
|
|
.. c:type:: PySendResult
|
|
|
|
The enum value used to represent different results of :c:func:`PyIter_Send`.
|
|
|
|
.. versionadded:: 3.10
|
|
|
|
|
|
.. c:function:: PySendResult PyIter_Send(PyObject *iter, PyObject *arg, PyObject **presult)
|
|
|
|
Sends the *arg* value into the iterator *iter*. Returns:
|
|
|
|
- ``PYGEN_RETURN`` if iterator returns. Return value is returned via *presult*.
|
|
- ``PYGEN_NEXT`` if iterator yields. Yielded value is returned via *presult*.
|
|
- ``PYGEN_ERROR`` if iterator has raised and exception. *presult* is set to ``NULL``.
|
|
|
|
.. versionadded:: 3.10
|