
Tuple Objects
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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.

int PyTuple_CheckExact(PyObject *p)

   Return true if *p* is a tuple object, but not an instance of a
   subtype of the tuple type.

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

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

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)``.

Py_ssize_t PyTuple_Size(PyObject *p)

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

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.

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.

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

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

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.

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*.

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*.

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``.

int PyTuple_ClearFreeList()

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