
Slice Objects
*************

PyTypeObject PySlice_Type

   The type object for slice objects.  This is the same as ``slice``
   and ``types.SliceType``.

int PySlice_Check(PyObject *ob)

   Return true if *ob* is a slice object; *ob* must not be *NULL*.

PyObject* PySlice_New(PyObject *start, PyObject *stop, PyObject *step)
    Return value: New reference.

   Return a new slice object with the given values.  The *start*,
   *stop*, and *step* parameters are used as the values of the slice
   object attributes of the same names.  Any of the values may be
   *NULL*, in which case the ``None`` will be used for the
   corresponding attribute.  Return *NULL* if the new object could not
   be allocated.

int PySlice_GetIndices(PySliceObject *slice, Py_ssize_t length, Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step)

   Retrieve the start, stop and step indices from the slice object
   *slice*, assuming a sequence of length *length*. Treats indices
   greater than *length* as errors.

   Returns 0 on success and -1 on error with no exception set (unless
   one of the indices was not ``None`` and failed to be converted to
   an integer, in which case -1 is returned with an exception set).

   You probably do not want to use this function.  If you want to use
   slice objects in versions of Python prior to 2.3, you would
   probably do well to incorporate the source of
   ``PySlice_GetIndicesEx()``, suitably renamed, in the source of your
   extension.

   Changed in version 2.5: This function used an ``int`` type for
   *length* and an ``int *`` type for *start*, *stop*, and *step*.
   This might require changes in your code for properly supporting
   64-bit systems.

int PySlice_GetIndicesEx(PySliceObject *slice, Py_ssize_t length, Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step, Py_ssize_t *slicelength)

   Usable replacement for ``PySlice_GetIndices()``.  Retrieve the
   start, stop, and step indices from the slice object *slice*
   assuming a sequence of length *length*, and store the length of the
   slice in *slicelength*.  Out of bounds indices are clipped in a
   manner consistent with the handling of normal slices.

   Returns 0 on success and -1 on error with exception set.

   New in version 2.3.

   Changed in version 2.5: This function used an ``int`` type for
   *length* and an ``int *`` type for *start*, *stop*, *step*, and
   *slicelength*. This might require changes in your code for properly
   supporting 64-bit systems.
