80 lines
2.9 KiB
ReStructuredText
80 lines
2.9 KiB
ReStructuredText
.. highlightlang:: c
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.. _slice-objects:
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Slice Objects
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-------------
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.. c:var:: PyTypeObject PySlice_Type
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.. index:: single: SliceType (in module types)
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The type object for slice objects. This is the same as ``slice`` and
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``types.SliceType``.
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.. c:function:: int PySlice_Check(PyObject *ob)
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Return true if *ob* is a slice object; *ob* must not be *NULL*.
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.. c:function:: PyObject* PySlice_New(PyObject *start, PyObject *stop, PyObject *step)
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Return a new slice object with the given values. The *start*, *stop*, and
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*step* parameters are used as the values of the slice object attributes of
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the same names. Any of the values may be *NULL*, in which case the
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``None`` will be used for the corresponding attribute. Return *NULL* if
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the new object could not be allocated.
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.. c:function:: int PySlice_GetIndices(PySliceObject *slice, Py_ssize_t length, Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step)
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Retrieve the start, stop and step indices from the slice object *slice*,
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assuming a sequence of length *length*. Treats indices greater than
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*length* as errors.
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Returns ``0`` on success and ``-1`` on error with no exception set (unless one of
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the indices was not :const:`None` and failed to be converted to an integer,
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in which case ``-1`` is returned with an exception set).
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You probably do not want to use this function. If you want to use slice
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objects in versions of Python prior to 2.3, you would probably do well to
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incorporate the source of :c:func:`PySlice_GetIndicesEx`, suitably renamed,
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in the source of your extension.
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.. versionchanged:: 2.5
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This function used an :c:type:`int` type for *length* and an
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:c:type:`int *` type for *start*, *stop*, and *step*. This might require
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changes in your code for properly supporting 64-bit systems.
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.. c:function:: 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)
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Usable replacement for :c:func:`PySlice_GetIndices`. Retrieve the start,
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stop, and step indices from the slice object *slice* assuming a sequence of
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length *length*, and store the length of the slice in *slicelength*. Out
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of bounds indices are clipped in a manner consistent with the handling of
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normal slices.
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Returns ``0`` on success and ``-1`` on error with exception set.
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.. versionadded:: 2.3
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.. versionchanged:: 2.5
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This function used an :c:type:`int` type for *length* and an
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:c:type:`int *` type for *start*, *stop*, *step*, and *slicelength*. This
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might require changes in your code for properly supporting 64-bit
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systems.
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Ellipsis Object
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---------------
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.. c:var:: PyObject *Py_Ellipsis
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The Python ``Ellipsis`` object. This object has no methods. It needs to be
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treated just like any other object with respect to reference counts. Like
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:c:data:`Py_None` it is a singleton object.
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