mirror of
https://github.com/python/cpython.git
synced 2024-11-29 21:05:33 +08:00
f9a444223c
svn+ssh://pythondev@svn.python.org/python/trunk ........ r81145 | benjamin.peterson | 2010-05-13 16:14:10 -0500 (Thu, 13 May 2010) | 1 line rip out mention of types.ListType #8703 ........
145 lines
4.5 KiB
ReStructuredText
145 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
|
|
|
|
This instance of :ctype:`PyTypeObject` represents the Python list type. This
|
|
is the same object as ``list`` 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)``.
|