
List Objects
************

PyListObject

   This subtype of ``PyObject`` represents a Python list object.

PyTypeObject PyList_Type

   This instance of ``PyTypeObject`` represents the Python list type.
   This is the same object as ``list`` in the Python layer.

int PyList_Check(PyObject *p)

   Return true if *p* is a list object or an instance of a subtype of
   the list type.

   Changed in version 2.2: Allowed subtypes to be accepted.

int PyList_CheckExact(PyObject *p)

   Return true if *p* is a list object, but not an instance of a
   subtype of the list type.

   New in version 2.2.

PyObject* PyList_New(Py_ssize_t len)
    Return value: New reference.

   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 ``PySequence_SetItem()``  or expose the object
     to Python code before setting all items to a real object with
     ``PyList_SetItem()``.

   Changed in version 2.5: This function used an ``int`` for *size*.
   This might require changes in your code for properly supporting
   64-bit systems.

Py_ssize_t PyList_Size(PyObject *list)

   Return the length of the list object in *list*; this is equivalent
   to ``len(list)`` on a list object.

   Changed in version 2.5: This function returned an ``int``. This
   might require changes in your code for properly supporting 64-bit
   systems.

Py_ssize_t PyList_GET_SIZE(PyObject *list)

   Macro form of ``PyList_Size()`` without error checking.

   Changed in version 2.5: This macro returned an ``int``. This might
   require changes in your code for properly supporting 64-bit
   systems.

PyObject* PyList_GetItem(PyObject *list, Py_ssize_t index)
    Return value: Borrowed reference.

   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
   ``IndexError`` exception.

   Changed in version 2.5: This function used an ``int`` for *index*.
   This might require changes in your code for properly supporting
   64-bit systems.

PyObject* PyList_GET_ITEM(PyObject *list, Py_ssize_t i)
    Return value: Borrowed reference.

   Macro form of ``PyList_GetItem()`` without error checking.

   Changed in version 2.5: This macro used an ``int`` for *i*. This
   might require changes in your code for properly supporting 64-bit
   systems.

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.

   Changed in version 2.5: This function used an ``int`` for *index*.
   This might require changes in your code for properly supporting
   64-bit systems.

void PyList_SET_ITEM(PyObject *list, Py_ssize_t i, PyObject *o)

   Macro form of ``PyList_SetItem()`` without error checking. This is
   normally only used to fill in new lists where there is no previous
   content.

   Note: This macro "steals" a reference to *item*, and, unlike
     ``PyList_SetItem()``, does *not* discard a reference to any item
     that it being replaced; any reference in *list* at position *i*
     will be leaked.

   Changed in version 2.5: This macro used an ``int`` for *i*. This
   might require changes in your code for properly supporting 64-bit
   systems.

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)``.

   Changed in version 2.5: This function used an ``int`` for *index*.
   This might require changes in your code for properly supporting
   64-bit systems.

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)``.

PyObject* PyList_GetSlice(PyObject *list, Py_ssize_t low, Py_ssize_t high)
    Return value: New reference.

   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]``.  Negative indices,
   as when slicing from Python, are not supported.

   Changed in version 2.5: This function used an ``int`` for *low* and
   *high*. This might require changes in your code for properly
   supporting 64-bit systems.

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.
   Negative indices, as when slicing from Python, are not supported.

   Changed in version 2.5: This function used an ``int`` for *low* and
   *high*. This might require changes in your code for properly
   supporting 64-bit systems.

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()``.

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()``.

PyObject* PyList_AsTuple(PyObject *list)
    Return value: New reference.

   Return a new tuple object containing the contents of *list*;
   equivalent to ``tuple(list)``.
