69 lines
2.6 KiB
ReStructuredText
69 lines
2.6 KiB
ReStructuredText
.. highlightlang:: c
|
|
|
|
.. _slice-objects:
|
|
|
|
Slice Objects
|
|
-------------
|
|
|
|
|
|
.. c:var:: PyTypeObject PySlice_Type
|
|
|
|
.. index:: single: SliceType (in module types)
|
|
|
|
The type object for slice objects. This is the same as ``slice`` and
|
|
``types.SliceType``.
|
|
|
|
|
|
.. c:function:: int PySlice_Check(PyObject *ob)
|
|
|
|
Return true if *ob* is a slice object; *ob* must not be *NULL*.
|
|
|
|
|
|
.. c:function:: PyObject* PySlice_New(PyObject *start, PyObject *stop, PyObject *step)
|
|
|
|
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.
|
|
|
|
|
|
.. c:function:: 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 :const:`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 :c:func:`PySlice_GetIndicesEx`, suitably renamed,
|
|
in the source of your extension.
|
|
|
|
.. versionchanged:: 2.5
|
|
This function used an :c:type:`int` type for *length* and an
|
|
:c:type:`int *` type for *start*, *stop*, and *step*. This might require
|
|
changes in your code for properly supporting 64-bit systems.
|
|
|
|
|
|
.. 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)
|
|
|
|
Usable replacement for :c:func:`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.
|
|
|
|
.. versionadded:: 2.3
|
|
|
|
.. versionchanged:: 2.5
|
|
This function used an :c:type:`int` type for *length* and an
|
|
:c:type:`int *` type for *start*, *stop*, *step*, and *slicelength*. This
|
|
might require changes in your code for properly supporting 64-bit
|
|
systems.
|