author | andy simpson <andrews@symbian.org> |
Fri, 08 Oct 2010 16:52:59 +0100 | |
changeset 119 | 931f2bbaabf7 |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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.. highlightlang:: c |
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.. _slice-objects: |
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Slice Objects |
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.. cvar:: 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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.. cfunction:: 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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.. cfunction:: 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 the |
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same names. Any of the values may be *NULL*, in which case the ``None`` will be |
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used for the corresponding attribute. Return *NULL* if the new object could not |
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be allocated. |
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.. cfunction:: 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 *length* as |
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errors. |
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Returns 0 on success and -1 on error with no exception set (unless one of the |
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indices was not :const:`None` and failed to be converted to an integer, in which |
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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 objects |
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in versions of Python prior to 2.3, you would probably do well to incorporate |
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the source of :cfunc:`PySlice_GetIndicesEx`, suitably renamed, in the source of |
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your extension. |
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.. cfunction:: 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 :cfunc:`PySlice_GetIndices`. Retrieve the start, stop, |
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and step indices from the slice object *slice* assuming a sequence of length |
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*length*, and store the length of the slice in *slicelength*. Out of bounds |
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indices are clipped in a manner consistent with the handling of normal slices. |
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Returns 0 on success and -1 on error with exception set. |
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.. versionadded:: 2.3 |