Edit File: list.txt
.. 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. .. versionchanged:: 2.2 Allowed subtypes to be accepted. .. 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. .. versionadded:: 2.2 .. 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`. .. versionchanged:: 2.5 This function used an :ctype:`int` for *size*. This might require changes in your code for properly supporting 64-bit systems. .. 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. .. versionchanged:: 2.5 This function returned an :ctype:`int`. This might require changes in your code for properly supporting 64-bit systems. .. cfunction:: Py_ssize_t PyList_GET_SIZE(PyObject *list) Macro form of :cfunc:`PyList_Size` without error checking. .. versionchanged:: 2.5 This macro returned an :ctype:`int`. This might require changes in your code for properly supporting 64-bit systems. .. 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. .. versionchanged:: 2.5 This function used an :ctype:`int` for *index*. This might require changes in your code for properly supporting 64-bit systems. .. cfunction:: PyObject* PyList_GET_ITEM(PyObject *list, Py_ssize_t i) Macro form of :cfunc:`PyList_GetItem` without error checking. .. versionchanged:: 2.5 This macro used an :ctype:`int` for *i*. This might require changes in your code for properly supporting 64-bit systems. .. 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. .. versionchanged:: 2.5 This function used an :ctype:`int` for *index*. This might require changes in your code for properly supporting 64-bit systems. .. 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 it being replaced; any reference in *list* at position *i* will be leaked. .. versionchanged:: 2.5 This macro used an :ctype:`int` for *i*. This might require changes in your code for properly supporting 64-bit systems. .. 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)``. .. versionchanged:: 2.5 This function used an :ctype:`int` for *index*. This might require changes in your code for properly supporting 64-bit systems. .. 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. .. versionchanged:: 2.5 This function used an :ctype:`int` for *low* and *high*. This might require changes in your code for properly supporting 64-bit systems. .. 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. .. versionchanged:: 2.5 This function used an :ctype:`int` for *low* and *high*. This might require changes in your code for properly supporting 64-bit systems. .. 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)``.
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