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authorGeorg Brandl <georg@python.org>2008-01-20 09:30:57 (GMT)
committerGeorg Brandl <georg@python.org>2008-01-20 09:30:57 (GMT)
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Split C API docs in Py3k branch.
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+.. highlightlang:: c
+
+.. _listobjects:
+
+List Objects
+------------
+
+.. index:: object: list
+
+
+.. ctype:: PyListObject
+
+ This subtype of :ctype:`PyObject` represents a Python list object.
+
+
+.. cvar:: PyTypeObject PyList_Type
+
+ .. index:: single: ListType (in module types)
+
+ This instance of :ctype:`PyTypeObject` represents the Python list type. This is
+ the same object as ``list`` and ``types.ListType`` in the Python layer.
+
+
+.. cfunction:: int PyList_Check(PyObject *p)
+
+ Return true if *p* is a list object or an instance of a subtype of the list
+ type.
+
+
+.. cfunction:: int PyList_CheckExact(PyObject *p)
+
+ Return true if *p* is a list object, but not an instance of a subtype of the
+ list type.
+
+
+.. cfunction:: PyObject* PyList_New(Py_ssize_t len)
+
+ Return a new list of length *len* on success, or *NULL* on failure.
+
+ .. note::
+
+ If *length* is greater than zero, the returned list object's items are set to
+ ``NULL``. Thus you cannot use abstract API functions such as
+ :cfunc:`PySequence_SetItem` or expose the object to Python code before setting
+ all items to a real object with :cfunc:`PyList_SetItem`.
+
+
+.. cfunction:: Py_ssize_t PyList_Size(PyObject *list)
+
+ .. index:: builtin: len
+
+ Return the length of the list object in *list*; this is equivalent to
+ ``len(list)`` on a list object.
+
+
+.. cfunction:: Py_ssize_t PyList_GET_SIZE(PyObject *list)
+
+ Macro form of :cfunc:`PyList_Size` without error checking.
+
+
+.. cfunction:: PyObject* PyList_GetItem(PyObject *list, Py_ssize_t index)
+
+ Return the object at position *pos* in the list pointed to by *p*. The position
+ must be positive, indexing from the end of the list is not supported. If *pos*
+ is out of bounds, return *NULL* and set an :exc:`IndexError` exception.
+
+
+.. cfunction:: PyObject* PyList_GET_ITEM(PyObject *list, Py_ssize_t i)
+
+ Macro form of :cfunc:`PyList_GetItem` without error checking.
+
+
+.. cfunction:: int PyList_SetItem(PyObject *list, Py_ssize_t index, PyObject *item)
+
+ Set the item at index *index* in list to *item*. Return ``0`` on success or
+ ``-1`` on failure.
+
+ .. note::
+
+ This function "steals" a reference to *item* and discards a reference to an item
+ already in the list at the affected position.
+
+
+.. cfunction:: void PyList_SET_ITEM(PyObject *list, Py_ssize_t i, PyObject *o)
+
+ Macro form of :cfunc:`PyList_SetItem` without error checking. This is normally
+ only used to fill in new lists where there is no previous content.
+
+ .. note::
+
+ This function "steals" a reference to *item*, and, unlike
+ :cfunc:`PyList_SetItem`, does *not* discard a reference to any item that it
+ being replaced; any reference in *list* at position *i* will be leaked.
+
+
+.. cfunction:: int PyList_Insert(PyObject *list, Py_ssize_t index, PyObject *item)
+
+ Insert the item *item* into list *list* in front of index *index*. Return ``0``
+ if successful; return ``-1`` and set an exception if unsuccessful. Analogous to
+ ``list.insert(index, item)``.
+
+
+.. cfunction:: int PyList_Append(PyObject *list, PyObject *item)
+
+ Append the object *item* at the end of list *list*. Return ``0`` if successful;
+ return ``-1`` and set an exception if unsuccessful. Analogous to
+ ``list.append(item)``.
+
+
+.. cfunction:: PyObject* PyList_GetSlice(PyObject *list, Py_ssize_t low, Py_ssize_t high)
+
+ Return a list of the objects in *list* containing the objects *between* *low*
+ and *high*. Return *NULL* and set an exception if unsuccessful. Analogous to
+ ``list[low:high]``.
+
+
+.. cfunction:: int PyList_SetSlice(PyObject *list, Py_ssize_t low, Py_ssize_t high, PyObject *itemlist)
+
+ Set the slice of *list* between *low* and *high* to the contents of *itemlist*.
+ Analogous to ``list[low:high] = itemlist``. The *itemlist* may be *NULL*,
+ indicating the assignment of an empty list (slice deletion). Return ``0`` on
+ success, ``-1`` on failure.
+
+
+.. cfunction:: int PyList_Sort(PyObject *list)
+
+ Sort the items of *list* in place. Return ``0`` on success, ``-1`` on failure.
+ This is equivalent to ``list.sort()``.
+
+
+.. cfunction:: int PyList_Reverse(PyObject *list)
+
+ Reverse the items of *list* in place. Return ``0`` on success, ``-1`` on
+ failure. This is the equivalent of ``list.reverse()``.
+
+
+.. cfunction:: PyObject* PyList_AsTuple(PyObject *list)
+
+ .. index:: builtin: tuple
+
+ Return a new tuple object containing the contents of *list*; equivalent to
+ ``tuple(list)``.