# 元组对象

`PyTupleObject`

  这个 `PyObject` 的子类型代表一个 Python 的元组对象。

PyTypeObject `PyTuple_Type`

  This instance of `PyTypeObject` represents the Python tuple type; it is the same object as `tuple` and `types.TupleType` in the Python layer..

int `PyTuple_Check`(PyObject *p)

  如果 p 是一个元组对象或者元组类型的子类型的实例，则返回真值。

  在 2.2 版更改: Allowed subtypes to be accepted.

int `PyTuple_CheckExact`(PyObject *p)

  如果 p 是一个元组对象，而不是一个元组子类型的实例，则返回真值。

  2.2 新版功能.

PyObject* `PyTuple_New`(Py_ssize_t len)
  Return value: New reference.

  Return a new tuple object of size len, or NULL on failure.

  在 2.5 版更改: This function used an `int` type for len. This might require changes in your code for properly supporting 64-bit systems.

PyObject* `PyTuple_Pack`(Py_ssize_t n, ...)
  Return value: New reference.

  Return a new tuple object of size n, or NULL on failure. The tuple values are initialized to the subsequent n C arguments pointing to Python objects. `PyTuple_Pack(2, a, b)` is equivalent to `Py_BuildValue("(OO)", a, b)`.

  2.4 新版功能.

  在 2.5 版更改: This function used an `int` type for n. This might require changes in your code for properly supporting 64-bit systems.

Py_ssize_t `PyTuple_Size`(PyObject *p)

  Take a pointer to a tuple object, and return the size of that tuple.

  在 2.5 版更改: This function returned an `int` type. This might require changes in your code for properly supporting 64-bit systems.

Py_ssize_t `PyTuple_GET_SIZE`(PyObject *p)

  Return the size of the tuple p, which must be non-NULL and point to a tuple; no error checking is performed.

  在 2.5 版更改: This function returned an `int` type. This might require changes in your code for properly supporting 64-bit systems.

PyObject* `PyTuple_GetItem`(PyObject *p, Py_ssize_t pos)
  Return value: Borrowed reference.

  Return the object at position pos in the tuple pointed to by p. If pos is out of bounds, return NULL and set an `IndexError` exception.

  在 2.5 版更改: This function used an `int` type for pos. This might require changes in your code for properly supporting 64-bit systems.

PyObject* `PyTuple_GET_ITEM`(PyObject *p, Py_ssize_t pos)
  Return value: Borrowed reference.

  Like `PyTuple_GetItem()`, but does no checking of its arguments.

  在 2.5 版更改: This function used an `int` type for pos. This might require changes in your code for properly supporting 64-bit systems.

PyObject* `PyTuple_GetSlice`(PyObject *p, Py_ssize_t low, Py_ssize_t high)
  Return value: New reference.

  Return the slice of the tuple pointed to by p between low and high, or NULL on failure. This is the equivalent of the Python expression `p[low:high]`. Indexing from the end of the list is not supported.

  在 2.5 版更改: This function used an `int` type for low and high. This might require changes in your code for properly supporting 64-bit systems.

int `PyTuple_SetItem`(PyObject *p, Py_ssize_t pos, PyObject *o)

  Insert a reference to object o at position pos of the tuple pointed to by p. Return `0` on success. If pos is out of bounds, return `-1` and set an `IndexError` exception.

  注解

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

  在 2.5 版更改: This function used an `int` type for pos. This might require changes in your code for properly supporting 64-bit systems.

void `PyTuple_SET_ITEM`(PyObject *p, Py_ssize_t pos, PyObject *o)

  Like `PyTuple_SetItem()`, but does no error checking, and should only be used to fill in brand new tuples.

  注解

  This macro “steals” a reference to o, and, unlike `PyTuple_SetItem()`, does not discard a reference to any item that is being replaced; any reference in the tuple at position pos will be leaked.

  在 2.5 版更改: This function used an `int` type for pos. This might require changes in your code for properly supporting 64-bit systems.

int `_PyTuple_Resize`(PyObject **p, Py_ssize_t newsize)

  Can be used to resize a tuple. newsize will be the new length of the tuple. Because tuples are supposed to be immutable, this should only be used if there is only one reference to the object. Do not use this if the tuple may already be known to some other part of the code. The tuple will always grow or shrink at the end. Think of this as destroying the old tuple and creating a new one, only more efficiently. Returns `0` on success. Client code should never assume that the resulting value of `*p` will be the same as before calling this function. If the object referenced by `*p` is replaced, the original `*p` is destroyed. On failure, returns `-1` and sets `*p` to NULL, and raises `MemoryError` or `SystemError`.

  在 2.2 版更改: Removed unused third parameter, last_is_sticky.

  在 2.5 版更改: This function used an `int` type for newsize. This might require changes in your code for properly supporting 64-bit systems.

int `PyTuple_ClearFreeList`()

  清空释放列表。 返回所释放的条目数。

  2.6 新版功能.