cpython/Doc/c-api/list.rst
Georg Brandl c6c3178942 Merged revisions 73190,73213,73257-73258,73260,73275,73294 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r73190 | georg.brandl | 2009-06-04 01:23:45 +0200 (Do, 04 Jun 2009) | 2 lines

  Avoid PendingDeprecationWarnings emitted by deprecated unittest methods.
........
  r73213 | georg.brandl | 2009-06-04 12:15:57 +0200 (Do, 04 Jun 2009) | 1 line

  #5967: note that the C slicing APIs do not support negative indices.
........
  r73257 | georg.brandl | 2009-06-06 19:50:05 +0200 (Sa, 06 Jun 2009) | 1 line

  #6211: elaborate a bit on ways to call the function.
........
  r73258 | georg.brandl | 2009-06-06 19:51:31 +0200 (Sa, 06 Jun 2009) | 1 line

  #6204: use a real reference instead of "see later".
........
  r73260 | georg.brandl | 2009-06-06 20:21:58 +0200 (Sa, 06 Jun 2009) | 1 line

  #6224: s/JPython/Jython/, and remove one link to a module nine years old.
........
  r73275 | georg.brandl | 2009-06-07 22:37:52 +0200 (So, 07 Jun 2009) | 1 line

  Add Ezio.
........
  r73294 | georg.brandl | 2009-06-08 15:34:52 +0200 (Mo, 08 Jun 2009) | 1 line

  #6194: O_SHLOCK/O_EXLOCK are not really more platform independent than lockf().
........
2009-06-08 13:41:29 +00:00

148 lines
4.5 KiB
ReStructuredText

.. 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 macro "steals" a reference to *item*, and, unlike
:cfunc:`PyList_SetItem`, does *not* discard a reference to any item that
is 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]``. Negative indices, as when slicing from Python, are not
supported.
.. 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. Negative indices, as when
slicing from Python, are not supported.
.. 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)``.