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List Objects — Python 3.13.5 documentation

type PyListObject¶

This subtype of PyObject represents a Python list object.

PyTypeObject PyList_Type¶

Part of the Stable ABI.

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. This function always succeeds.

int PyList_CheckExact(PyObject *p)¶

Return true if p is a list object, but not an instance of a subtype of the list type. This function always succeeds.

PyObject *PyList_New(Py_ssize_t len)¶

Return value: New reference. Part of the Stable ABI.

Return a new list of length len on success, or NULL on failure.

Py_ssize_t PyList_Size(PyObject *list)¶

Part of the Stable ABI.

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

Py_ssize_t PyList_GET_SIZE(PyObject *list)¶

Similar to PyList_Size(), but without error checking.

PyObject *PyList_GetItemRef(PyObject *list, Py_ssize_t index)¶

Return value: New reference. Part of the Stable ABI since version 3.13.

Return the object at position index in the list pointed to by list. The position must be non-negative; indexing from the end of the list is not supported. If index is out of bounds (<0 or >=len(list)), return NULL and set an IndexError exception.

Added in version 3.13.

PyObject *PyList_GetItem(PyObject *list, Py_ssize_t index)¶

Return value: Borrowed reference. Part of the Stable ABI.

Like PyList_GetItemRef(), but returns a borrowed reference instead of a strong reference.

PyObject *PyList_GET_ITEM(PyObject *list, Py_ssize_t i)¶

Return value: Borrowed reference.

Similar to PyList_GetItem(), but without error checking.

int PyList_SetItem(PyObject *list, Py_ssize_t index, PyObject *item)¶

Part of the Stable ABI.

Set the item at index index in list to item. Return 0 on success. If index is out of bounds, return -1 and set an IndexError exception.

Note

This function “steals” a reference to item and discards a reference to an item already in the list at the affected position.

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.

Bounds checking is performed as an assertion if Python is built in debug mode or with assertions.

Note

This macro “steals” a reference to item, and, unlike PyList_SetItem(), does not discard a reference to any item that is being replaced; any reference in list at position i will be leaked.

int PyList_Insert(PyObject *list, Py_ssize_t index, PyObject *item)¶

Part of the Stable ABI.

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).

int PyList_Append(PyObject *list, PyObject *item)¶

Part of the Stable ABI.

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. Part of the Stable ABI.

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]. Indexing from the end of the list is not supported.

int PyList_SetSlice(PyObject *list, Py_ssize_t low, Py_ssize_t high, PyObject *itemlist)¶

Part of the Stable ABI.

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. Indexing from the end of the list is not supported.

int PyList_Extend(PyObject *list, PyObject *iterable)¶

Extend list with the contents of iterable. This is the same as PyList_SetSlice(list, PY_SSIZE_T_MAX, PY_SSIZE_T_MAX, iterable) and analogous to list.extend(iterable) or list += iterable.

Raise an exception and return -1 if list is not a list object. Return 0 on success.

Added in version 3.13.

int PyList_Clear(PyObject *list)¶

Remove all items from list. This is the same as PyList_SetSlice(list, 0, PY_SSIZE_T_MAX, NULL) and analogous to list.clear() or del list[:].

Raise an exception and return -1 if list is not a list object. Return 0 on success.

Added in version 3.13.

int PyList_Sort(PyObject *list)¶

Part of the Stable ABI.

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)¶

Part of the Stable ABI.

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. Part of the Stable ABI.

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

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