mirror of
https://github.com/python/cpython
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315fc52db1
I think that none of these API calls can fail, but only few of them are documented as such. Add the sentence "This function always succeeds" (which is the same already used e.g. by PyNumber_Check) to all of them.
145 lines
4.6 KiB
ReStructuredText
145 lines
4.6 KiB
ReStructuredText
.. highlight:: c
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.. _listobjects:
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List Objects
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------------
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.. index:: object: list
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.. c:type:: PyListObject
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This subtype of :c:type:`PyObject` represents a Python list object.
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.. c:var:: PyTypeObject PyList_Type
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This instance of :c:type:`PyTypeObject` represents the Python list type.
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This is the same object as :class:`list` in the Python layer.
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.. c:function:: int PyList_Check(PyObject *p)
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Return true if *p* is a list object or an instance of a subtype of the list
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type. This function always succeeds.
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.. c:function:: int PyList_CheckExact(PyObject *p)
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Return true if *p* is a list object, but not an instance of a subtype of
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the list type. This function always succeeds.
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.. c:function:: PyObject* PyList_New(Py_ssize_t len)
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Return a new list of length *len* on success, or ``NULL`` on failure.
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.. note::
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If *len* is greater than zero, the returned list object's items are
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set to ``NULL``. Thus you cannot use abstract API functions such as
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:c:func:`PySequence_SetItem` or expose the object to Python code before
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setting all items to a real object with :c:func:`PyList_SetItem`.
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.. c:function:: Py_ssize_t PyList_Size(PyObject *list)
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.. index:: builtin: len
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Return the length of the list object in *list*; this is equivalent to
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``len(list)`` on a list object.
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.. c:function:: Py_ssize_t PyList_GET_SIZE(PyObject *list)
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Macro form of :c:func:`PyList_Size` without error checking.
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.. c:function:: PyObject* PyList_GetItem(PyObject *list, Py_ssize_t index)
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Return the object at position *index* in the list pointed to by *list*. The
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position must be non-negative; indexing from the end of the list is not
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supported. If *index* is out of bounds (<0 or >=len(list)),
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return ``NULL`` and set an :exc:`IndexError` exception.
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.. c:function:: PyObject* PyList_GET_ITEM(PyObject *list, Py_ssize_t i)
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Macro form of :c:func:`PyList_GetItem` without error checking.
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.. c:function:: int PyList_SetItem(PyObject *list, Py_ssize_t index, PyObject *item)
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Set the item at index *index* in list to *item*. Return ``0`` on success.
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If *index* is out of bounds, return ``-1`` and set an :exc:`IndexError`
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exception.
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.. note::
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This function "steals" a reference to *item* and discards a reference to
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an item already in the list at the affected position.
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.. c:function:: void PyList_SET_ITEM(PyObject *list, Py_ssize_t i, PyObject *o)
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Macro form of :c:func:`PyList_SetItem` without error checking. This is
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normally only used to fill in new lists where there is no previous content.
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.. note::
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This macro "steals" a reference to *item*, and, unlike
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:c:func:`PyList_SetItem`, does *not* discard a reference to any item that
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is being replaced; any reference in *list* at position *i* will be
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leaked.
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.. c:function:: int PyList_Insert(PyObject *list, Py_ssize_t index, PyObject *item)
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Insert the item *item* into list *list* in front of index *index*. Return
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``0`` if successful; return ``-1`` and set an exception if unsuccessful.
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Analogous to ``list.insert(index, item)``.
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.. c:function:: int PyList_Append(PyObject *list, PyObject *item)
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Append the object *item* at the end of list *list*. Return ``0`` if
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successful; return ``-1`` and set an exception if unsuccessful. Analogous
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to ``list.append(item)``.
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.. c:function:: PyObject* PyList_GetSlice(PyObject *list, Py_ssize_t low, Py_ssize_t high)
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Return a list of the objects in *list* containing the objects *between* *low*
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and *high*. Return ``NULL`` and set an exception if unsuccessful. Analogous
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to ``list[low:high]``. Indexing from the end of the list is not supported.
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.. c:function:: int PyList_SetSlice(PyObject *list, Py_ssize_t low, Py_ssize_t high, PyObject *itemlist)
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Set the slice of *list* between *low* and *high* to the contents of
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*itemlist*. Analogous to ``list[low:high] = itemlist``. The *itemlist* may
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be ``NULL``, indicating the assignment of an empty list (slice deletion).
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Return ``0`` on success, ``-1`` on failure. Indexing from the end of the
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list is not supported.
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.. c:function:: int PyList_Sort(PyObject *list)
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Sort the items of *list* in place. Return ``0`` on success, ``-1`` on
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failure. This is equivalent to ``list.sort()``.
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.. c:function:: int PyList_Reverse(PyObject *list)
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Reverse the items of *list* in place. Return ``0`` on success, ``-1`` on
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failure. This is the equivalent of ``list.reverse()``.
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.. c:function:: PyObject* PyList_AsTuple(PyObject *list)
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.. index:: builtin: tuple
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Return a new tuple object containing the contents of *list*; equivalent to
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``tuple(list)``.
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