59 lines
2.1 KiB
ReStructuredText
59 lines
2.1 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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The type object for slice objects. This is the same as :class:`slice` in the
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Python layer.
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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(PyObject *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.
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.. versionchanged:: 3.2
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The parameter type for the *slice* parameter was ``PySliceObject*``
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before.
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.. c:function:: int PySlice_GetIndicesEx(PyObject *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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.. versionchanged:: 3.2
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The parameter type for the *slice* parameter was ``PySliceObject*``
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before.
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