List Objects - Python 3.6.15 documentation 编辑
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 aslist
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.
- int
PyList_CheckExact
(PyObject *p) Return true if p is a list object, but not an instance of a subtype of the list type.
- PyObject*
PyList_New
(Py_ssize_t len) - Return value: New reference.
Return a new list of length len on success, or NULL on failure.
Note
If len is greater than zero, the returned list object’s items are set to
NULL
. Thus you cannot use abstract API functions such asPySequence_SetItem()
or expose the object to Python code before setting all items to a real object withPyList_SetItem()
.
- Py_ssize_t
PyList_Size
(PyObject *list) 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) Macro form of
PyList_Size()
without error checking.
- PyObject*
PyList_GetItem
(PyObject *list, Py_ssize_t index) - Return value: Borrowed reference.
Return the object at position index in the list pointed to by list. The position must be positive, indexing from the end of the list is not supported. If index is out of bounds, return NULL and set an
IndexError
exception.
- PyObject*
PyList_GET_ITEM
(PyObject *list, Py_ssize_t i) - Return value: Borrowed reference.
Macro form of
PyList_GetItem()
without error checking.
- 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.
- 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.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) 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 tolist.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 tolist.append(item)
.
- PyObject*
PyList_GetSlice
(PyObject *list, Py_ssize_t low, Py_ssize_t 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]
. Negative indices, as when slicing from Python, are not supported.
- 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). Return0
on success,-1
on failure. Negative indices, as when slicing from Python, are not supported.
- int
PyList_Sort
(PyObject *list) Sort the items of list in place. Return
0
on success,-1
on failure. This is equivalent tolist.sort()
.
- int
PyList_Reverse
(PyObject *list) Reverse the items of list in place. Return
0
on success,-1
on failure. This is the equivalent oflist.reverse()
.
- PyObject*
PyList_AsTuple
(PyObject *list) - Return value: New reference.
Return a new tuple object containing the contents of list; equivalent to
tuple(list)
.
- int
PyList_ClearFreeList
() Clear the free list. Return the total number of freed items.
New in version 3.3.
如果你对这篇内容有疑问,欢迎到本站社区发帖提问 参与讨论,获取更多帮助,或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱,如果其他用户或者作者回复了您的评论,将不能在第一时间通知您!
发布评论