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.
