
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 ``tuple`` and ``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(Py_ssize_t len)
    Return value: New reference.

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

   Changed in version 2.5: 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)``.

   New in version 2.4.

   Changed in version 2.5: 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.

   Changed in version 2.5: 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.

   Changed in version 2.5: 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 sets an ``IndexError``
   exception.

   Changed in version 2.5: 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.

   Changed in version 2.5: 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.

   Take a slice of the tuple pointed to by *p* from *low* to *high*
   and return it as a new tuple.

   Changed in version 2.5: 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.

   Note: This function "steals" a reference to *o*.

   Changed in version 2.5: 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.

   Note: This function "steals" a reference to *o*.

   Changed in version 2.5: 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``.

   Changed in version 2.2: Removed unused third parameter,
   *last_is_sticky*.

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

int PyTuple_ClearFreeList()

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

   New in version 2.6.
