元組（Tuple）物件
*****************

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.

   2.2 版更變: 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.

   2.2 版新加入.

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

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

   2.5 版更變: 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 版新加入.

   2.5 版更變: 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.

   2.5 版更變: 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.

   2.5 版更變: 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.

   2.5 版更變: 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.

   2.5 版更變: 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.

   2.5 版更變: 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.

   備註: This function 「steals」 a reference to *o* and discards a
     reference to an item already in the tuple at the affected
     position.

   2.5 版更變: 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.

   備註: 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.

   2.5 版更變: 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".

   2.2 版更變: Removed unused third parameter, *last_is_sticky*.

   2.5 版更變: 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.

   2.6 版新加入.
