##
7.3.4 Tuple Objects

`PyTupleObject`
  This subtype of `PyObject` represents a Python tuple object.

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

int `PyTuple_Check`(PyObject *p)
  Return true if p is a tuple object or an instance of a subtype of the tuple type. Changed in version 2.2: Allowed subtypes to be accepted.

int `PyTuple_CheckExact`(PyObject *p)
  Return true if p is a tuple object, but not an instance of a subtype of the tuple type. New in version 2.2.

PyObject* `PyTuple_New`(int len)
  Return value: New reference.
  Return a new tuple object of size len, or `NULL` on failure.

int `PyTuple_Size`(PyObject *p)
  Takes a pointer to a tuple object, and returns the size of that tuple.

int `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.

PyObject* `PyTuple_GetItem`(PyObject *p, int pos)
  Return value: Borrowed reference.
  Returns the object at position pos in the tuple pointed to by p. If pos is out of bounds, returns `NULL` and sets an `IndexError` exception.

PyObject* `PyTuple_GET_ITEM`(PyObject *p, int pos)
  Return value: Borrowed reference.
  Like `PyTuple_GetItem()`, but does no checking of its arguments.

PyObject* `PyTuple_GetSlice`(PyObject *p, int low, int high)
  Return value: New reference.
  Takes a slice of the tuple pointed to by p from low to high and returns it as a new tuple.

int `PyTuple_SetItem`(PyObject *p, int pos, PyObject *o)
  Inserts a reference to object o at position pos of the tuple pointed to by p. It returns `0` on success. Note: This function ``steals'' a reference to o.

void `PyTuple_SET_ITEM`(PyObject *p, int pos, PyObject *o)
  Like `PyTuple_SetItem()`, but does no error checking, and should only be used to fill in brand new tuples. Note: This function ``steals'' a reference to o.

int `_PyTuple_Resize`(PyObject **p, int 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`. Changed in version 2.2: Removed unused third parameter, last_is_sticky.