# 列表对象

`PyListObject`

  这个类型，`PyObject`，代表这一个Python列表对象。

PyTypeObject `PyList_Type`

  这个实例，`PyTypeObject`，代表Python列表类型。这个就和 `list` 一样在Python层

int `PyList_Check`(PyObject *p)

  如果p是一个列表对象或者子类型的实例是一个列表类型就返回true

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.

  注解

  If len 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()`.

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.

  注解

  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.

  注解

  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 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, 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). Return `0` 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 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)`.

int `PyList_ClearFreeList`()

  Clear the free list. Return the total number of freed items.

  3.3 新版功能.