7.3.5 List Objects

7.3.5 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 types.ListType.

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(

int 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().

int PyList_Size(

PyObject *list)

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

int PyList_GET_SIZE(

PyObject *list)

Macro form of PyList_Size() without error checking.

PyObject* PyList_GetItem(

PyObject *list, int 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.

PyObject* PyList_GET_ITEM(

PyObject *list, int i)

Return value: Borrowed reference.

Macro form of PyList_GetItem() without error checking.

int PyList_SetItem(

PyObject *list, int 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.

void PyList_SET_ITEM(

PyObject *list, int 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 function ``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.

int PyList_Insert(

PyObject *list, int 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).

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, int low, int 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].

int PyList_SetSlice(

PyObject *list, int low, int 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.

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)".

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Python/C API Reference Manual

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Release 2.4.4c1, documentation updated on 11 October 2006.