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| 54 | ||
| 55 | <H2><A NAME="SECTION009570000000000000000"></A><A NAME="slice-objects"></A> | |
| 56 | <BR> | |
| 57 | 7.5.7 Slice Objects | |
| 58 | </H2> | |
| 59 | ||
| 60 | <P> | |
| 61 | <dl><dt>PyTypeObject <b><tt id='l2h-711' xml:id='l2h-711' class="cdata">PySlice_Type</tt></b></dt> | |
| 62 | <dd> | |
| 63 | The type object for slice objects. This is the same as | |
| 64 | <code>types.SliceType</code>. | |
| 65 | <a id='l2h-713' xml:id='l2h-713'></a></dd></dl> | |
| 66 | ||
| 67 | <P> | |
| 68 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-714' xml:id='l2h-714' class="cfunction">PySlice_Check</tt></b>(</nobr></td><td>PyObject *<var>ob</var>)</td></tr></table></dt> | |
| 69 | <dd> | |
| 70 | Return true if <var>ob</var> is a slice object; <var>ob</var> must not be | |
| 71 | <tt class="constant">NULL</tt>. | |
| 72 | </dd></dl> | |
| 73 | ||
| 74 | <P> | |
| 75 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject* <b><tt id='l2h-715' xml:id='l2h-715' class="cfunction">PySlice_New</tt></b>(</nobr></td><td>PyObject *<var>start</var>, PyObject *<var>stop</var>, | |
| 76 | PyObject *<var>step</var>)</td></tr></table></dt> | |
| 77 | <dd> | |
| 78 | <div class="refcount-info"> | |
| 79 | <span class="label">Return value:</span> | |
| 80 | <span class="value">New reference.</span> | |
| 81 | </div> | |
| 82 | Return a new slice object with the given values. The <var>start</var>, | |
| 83 | <var>stop</var>, and <var>step</var> parameters are used as the values of the | |
| 84 | slice object attributes of the same names. Any of the values may be | |
| 85 | <tt class="constant">NULL</tt>, in which case the <code>None</code> will be used for the | |
| 86 | corresponding attribute. Return <tt class="constant">NULL</tt> if the new object could | |
| 87 | not be allocated. | |
| 88 | </dd></dl> | |
| 89 | ||
| 90 | <P> | |
| 91 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-716' xml:id='l2h-716' class="cfunction">PySlice_GetIndices</tt></b>(</nobr></td><td>PySliceObject *<var>slice</var>, int <var>length</var>, | |
| 92 | int *<var>start</var>, int *<var>stop</var>, int *<var>step</var>)</td></tr></table></dt> | |
| 93 | <dd> | |
| 94 | Retrieve the start, stop and step indices from the slice object | |
| 95 | <var>slice</var>, assuming a sequence of length <var>length</var>. Treats | |
| 96 | indices greater than <var>length</var> as errors. | |
| 97 | ||
| 98 | <P> | |
| 99 | Returns 0 on success and -1 on error with no exception set (unless one | |
| 100 | of the indices was not <tt class="constant">None</tt> and failed to be converted to | |
| 101 | an integer, in which case -1 is returned with an exception set). | |
| 102 | ||
| 103 | <P> | |
| 104 | You probably do not want to use this function. If you want to use | |
| 105 | slice objects in versions of Python prior to 2.3, you would probably | |
| 106 | do well to incorporate the source of <tt class="cfunction">PySlice_GetIndicesEx</tt>, | |
| 107 | suitably renamed, in the source of your extension. | |
| 108 | </dd></dl> | |
| 109 | ||
| 110 | <P> | |
| 111 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-717' xml:id='l2h-717' class="cfunction">PySlice_GetIndicesEx</tt></b>(</nobr></td><td>PySliceObject *<var>slice</var>, int <var>length</var>, | |
| 112 | int *<var>start</var>, int *<var>stop</var>, int *<var>step</var>, | |
| 113 | int *<var>slicelength</var>)</td></tr></table></dt> | |
| 114 | <dd> | |
| 115 | Usable replacement for <tt class="cfunction">PySlice_GetIndices</tt>. Retrieve the | |
| 116 | start, stop, and step indices from the slice object <var>slice</var> | |
| 117 | assuming a sequence of length <var>length</var>, and store the length of | |
| 118 | the slice in <var>slicelength</var>. Out of bounds indices are clipped in | |
| 119 | a manner consistent with the handling of normal slices. | |
| 120 | ||
| 121 | <P> | |
| 122 | Returns 0 on success and -1 on error with exception set. | |
| 123 | ||
| 124 | <P> | |
| 125 | ||
| 126 | <span class="versionnote">New in version 2.3.</span> | |
| 127 | ||
| 128 | </dd></dl> | |
| 129 | ||
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| 166 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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