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55 | <H1><A NAME="SECTION008300000000000000000"></A><A NAME="sequence"></A> | |
56 | <BR> | |
57 | 6.3 Sequence Protocol | |
58 | </H1> | |
59 | ||
60 | <P> | |
61 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-308' xml:id='l2h-308' class="cfunction">PySequence_Check</tt></b>(</nobr></td><td>PyObject *<var>o</var>)</td></tr></table></dt> | |
62 | <dd> | |
63 | Return <code>1</code> if the object provides sequence protocol, and | |
64 | <code>0</code> otherwise. This function always succeeds. | |
65 | </dd></dl> | |
66 | ||
67 | <P> | |
68 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-309' xml:id='l2h-309' class="cfunction">PySequence_Size</tt></b>(</nobr></td><td>PyObject *<var>o</var>)</td></tr></table></dt> | |
69 | <dd> | |
70 | Returns the number of objects in sequence <var>o</var> on success, and | |
71 | <code>-1</code> on failure. For objects that do not provide sequence | |
72 | protocol, this is equivalent to the Python expression | |
73 | "<tt class="samp">len(<var>o</var>)</tt>".<a id='l2h-310' xml:id='l2h-310'></a></dd></dl> | |
74 | ||
75 | <P> | |
76 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-311' xml:id='l2h-311' class="cfunction">PySequence_Length</tt></b>(</nobr></td><td>PyObject *<var>o</var>)</td></tr></table></dt> | |
77 | <dd> | |
78 | Alternate name for <tt class="cfunction">PySequence_Size()</tt>. | |
79 | </dd></dl> | |
80 | ||
81 | <P> | |
82 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject* <b><tt id='l2h-312' xml:id='l2h-312' class="cfunction">PySequence_Concat</tt></b>(</nobr></td><td>PyObject *<var>o1</var>, PyObject *<var>o2</var>)</td></tr></table></dt> | |
83 | <dd> | |
84 | <div class="refcount-info"> | |
85 | <span class="label">Return value:</span> | |
86 | <span class="value">New reference.</span> | |
87 | </div> | |
88 | Return the concatenation of <var>o1</var> and <var>o2</var> on success, and | |
89 | <tt class="constant">NULL</tt> on failure. This is the equivalent of the Python | |
90 | expression "<tt class="samp"><var>o1</var> + <var>o2</var></tt>". | |
91 | </dd></dl> | |
92 | ||
93 | <P> | |
94 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject* <b><tt id='l2h-313' xml:id='l2h-313' class="cfunction">PySequence_Repeat</tt></b>(</nobr></td><td>PyObject *<var>o</var>, int <var>count</var>)</td></tr></table></dt> | |
95 | <dd> | |
96 | <div class="refcount-info"> | |
97 | <span class="label">Return value:</span> | |
98 | <span class="value">New reference.</span> | |
99 | </div> | |
100 | Return the result of repeating sequence object <var>o</var> <var>count</var> | |
101 | times, or <tt class="constant">NULL</tt> on failure. This is the equivalent of the Python | |
102 | expression "<tt class="samp"><var>o</var> * <var>count</var></tt>". | |
103 | </dd></dl> | |
104 | ||
105 | <P> | |
106 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject* <b><tt id='l2h-314' xml:id='l2h-314' class="cfunction">PySequence_InPlaceConcat</tt></b>(</nobr></td><td>PyObject *<var>o1</var>, | |
107 | PyObject *<var>o2</var>)</td></tr></table></dt> | |
108 | <dd> | |
109 | <div class="refcount-info"> | |
110 | <span class="label">Return value:</span> | |
111 | <span class="value">New reference.</span> | |
112 | </div> | |
113 | Return the concatenation of <var>o1</var> and <var>o2</var> on success, and | |
114 | <tt class="constant">NULL</tt> on failure. The operation is done <em>in-place</em> when | |
115 | <var>o1</var> supports it. This is the equivalent of the Python | |
116 | expression "<tt class="samp"><var>o1</var> += <var>o2</var></tt>". | |
117 | </dd></dl> | |
118 | ||
119 | <P> | |
120 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject* <b><tt id='l2h-315' xml:id='l2h-315' class="cfunction">PySequence_InPlaceRepeat</tt></b>(</nobr></td><td>PyObject *<var>o</var>, int <var>count</var>)</td></tr></table></dt> | |
121 | <dd> | |
122 | <div class="refcount-info"> | |
123 | <span class="label">Return value:</span> | |
124 | <span class="value">New reference.</span> | |
125 | </div> | |
126 | Return the result of repeating sequence object <var>o</var> <var>count</var> | |
127 | times, or <tt class="constant">NULL</tt> on failure. The operation is done <em>in-place</em> | |
128 | when <var>o</var> supports it. This is the equivalent of the Python | |
129 | expression "<tt class="samp"><var>o</var> *= <var>count</var></tt>". | |
130 | </dd></dl> | |
131 | ||
132 | <P> | |
133 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject* <b><tt id='l2h-316' xml:id='l2h-316' class="cfunction">PySequence_GetItem</tt></b>(</nobr></td><td>PyObject *<var>o</var>, int <var>i</var>)</td></tr></table></dt> | |
134 | <dd> | |
135 | <div class="refcount-info"> | |
136 | <span class="label">Return value:</span> | |
137 | <span class="value">New reference.</span> | |
138 | </div> | |
139 | Return the <var>i</var>th element of <var>o</var>, or <tt class="constant">NULL</tt> on failure. | |
140 | This is the equivalent of the Python expression | |
141 | "<tt class="samp"><var>o</var>[<var>i</var>]</tt>". | |
142 | </dd></dl> | |
143 | ||
144 | <P> | |
145 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject* <b><tt id='l2h-317' xml:id='l2h-317' class="cfunction">PySequence_GetSlice</tt></b>(</nobr></td><td>PyObject *<var>o</var>, int <var>i1</var>, int <var>i2</var>)</td></tr></table></dt> | |
146 | <dd> | |
147 | <div class="refcount-info"> | |
148 | <span class="label">Return value:</span> | |
149 | <span class="value">New reference.</span> | |
150 | </div> | |
151 | Return the slice of sequence object <var>o</var> between <var>i1</var> and | |
152 | <var>i2</var>, or <tt class="constant">NULL</tt> on failure. This is the equivalent of the | |
153 | Python expression "<tt class="samp"><var>o</var>[<var>i1</var>:<var>i2</var>]</tt>". | |
154 | </dd></dl> | |
155 | ||
156 | <P> | |
157 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-318' xml:id='l2h-318' class="cfunction">PySequence_SetItem</tt></b>(</nobr></td><td>PyObject *<var>o</var>, int <var>i</var>, PyObject *<var>v</var>)</td></tr></table></dt> | |
158 | <dd> | |
159 | Assign object <var>v</var> to the <var>i</var>th element of <var>o</var>. Returns | |
160 | <code>-1</code> on failure. This is the equivalent of the Python | |
161 | statement "<tt class="samp"><var>o</var>[<var>i</var>] = <var>v</var></tt>". This function <em>does not</em> | |
162 | steal a reference to <var>v</var>. | |
163 | </dd></dl> | |
164 | ||
165 | <P> | |
166 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-319' xml:id='l2h-319' class="cfunction">PySequence_DelItem</tt></b>(</nobr></td><td>PyObject *<var>o</var>, int <var>i</var>)</td></tr></table></dt> | |
167 | <dd> | |
168 | Delete the <var>i</var>th element of object <var>o</var>. Returns <code>-1</code> | |
169 | on failure. This is the equivalent of the Python statement | |
170 | "<tt class="samp">del <var>o</var>[<var>i</var>]</tt>". | |
171 | </dd></dl> | |
172 | ||
173 | <P> | |
174 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-320' xml:id='l2h-320' class="cfunction">PySequence_SetSlice</tt></b>(</nobr></td><td>PyObject *<var>o</var>, int <var>i1</var>, | |
175 | int <var>i2</var>, PyObject *<var>v</var>)</td></tr></table></dt> | |
176 | <dd> | |
177 | Assign the sequence object <var>v</var> to the slice in sequence object | |
178 | <var>o</var> from <var>i1</var> to <var>i2</var>. This is the equivalent of the | |
179 | Python statement "<tt class="samp"><var>o</var>[<var>i1</var>:<var>i2</var>] = <var>v</var></tt>". | |
180 | </dd></dl> | |
181 | ||
182 | <P> | |
183 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-321' xml:id='l2h-321' class="cfunction">PySequence_DelSlice</tt></b>(</nobr></td><td>PyObject *<var>o</var>, int <var>i1</var>, int <var>i2</var>)</td></tr></table></dt> | |
184 | <dd> | |
185 | Delete the slice in sequence object <var>o</var> from <var>i1</var> to | |
186 | <var>i2</var>. Returns <code>-1</code> on failure. This is the equivalent of | |
187 | the Python statement "<tt class="samp">del <var>o</var>[<var>i1</var>:<var>i2</var>]</tt>". | |
188 | </dd></dl> | |
189 | ||
190 | <P> | |
191 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject* <b><tt id='l2h-322' xml:id='l2h-322' class="cfunction">PySequence_Tuple</tt></b>(</nobr></td><td>PyObject *<var>o</var>)</td></tr></table></dt> | |
192 | <dd> | |
193 | <div class="refcount-info"> | |
194 | <span class="label">Return value:</span> | |
195 | <span class="value">New reference.</span> | |
196 | </div> | |
197 | Returns the <var>o</var> as a tuple on success, and <tt class="constant">NULL</tt> on failure. | |
198 | This is equivalent to the Python expression "<tt class="samp">tuple(<var>o</var>)</tt>". | |
199 | <a id='l2h-323' xml:id='l2h-323'></a></dd></dl> | |
200 | ||
201 | <P> | |
202 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-324' xml:id='l2h-324' class="cfunction">PySequence_Count</tt></b>(</nobr></td><td>PyObject *<var>o</var>, PyObject *<var>value</var>)</td></tr></table></dt> | |
203 | <dd> | |
204 | Return the number of occurrences of <var>value</var> in <var>o</var>, that is, | |
205 | return the number of keys for which <code><var>o</var>[<var>key</var>] == | |
206 | <var>value</var></code>. On failure, return <code>-1</code>. This is equivalent to | |
207 | the Python expression "<tt class="samp"><var>o</var>.count(<var>value</var>)</tt>". | |
208 | </dd></dl> | |
209 | ||
210 | <P> | |
211 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-325' xml:id='l2h-325' class="cfunction">PySequence_Contains</tt></b>(</nobr></td><td>PyObject *<var>o</var>, PyObject *<var>value</var>)</td></tr></table></dt> | |
212 | <dd> | |
213 | Determine if <var>o</var> contains <var>value</var>. If an item in <var>o</var> is | |
214 | equal to <var>value</var>, return <code>1</code>, otherwise return <code>0</code>. | |
215 | On error, return <code>-1</code>. This is equivalent to the Python | |
216 | expression "<tt class="samp"><var>value</var> in <var>o</var></tt>". | |
217 | </dd></dl> | |
218 | ||
219 | <P> | |
220 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-326' xml:id='l2h-326' class="cfunction">PySequence_Index</tt></b>(</nobr></td><td>PyObject *<var>o</var>, PyObject *<var>value</var>)</td></tr></table></dt> | |
221 | <dd> | |
222 | Return the first index <var>i</var> for which <code><var>o</var>[<var>i</var>] == | |
223 | <var>value</var></code>. On error, return <code>-1</code>. This is equivalent to | |
224 | the Python expression "<tt class="samp"><var>o</var>.index(<var>value</var>)</tt>". | |
225 | </dd></dl> | |
226 | ||
227 | <P> | |
228 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject* <b><tt id='l2h-327' xml:id='l2h-327' class="cfunction">PySequence_List</tt></b>(</nobr></td><td>PyObject *<var>o</var>)</td></tr></table></dt> | |
229 | <dd> | |
230 | <div class="refcount-info"> | |
231 | <span class="label">Return value:</span> | |
232 | <span class="value">New reference.</span> | |
233 | </div> | |
234 | Return a list object with the same contents as the arbitrary | |
235 | sequence <var>o</var>. The returned list is guaranteed to be new. | |
236 | </dd></dl> | |
237 | ||
238 | <P> | |
239 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject* <b><tt id='l2h-328' xml:id='l2h-328' class="cfunction">PySequence_Tuple</tt></b>(</nobr></td><td>PyObject *<var>o</var>)</td></tr></table></dt> | |
240 | <dd> | |
241 | <div class="refcount-info"> | |
242 | <span class="label">Return value:</span> | |
243 | <span class="value">New reference.</span> | |
244 | </div> | |
245 | Return a tuple object with the same contents as the arbitrary | |
246 | sequence <var>o</var>. If <var>o</var> is a tuple, a new reference will be | |
247 | returned, otherwise a tuple will be constructed with the appropriate | |
248 | contents. | |
249 | </dd></dl> | |
250 | ||
251 | <P> | |
252 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject* <b><tt id='l2h-329' xml:id='l2h-329' class="cfunction">PySequence_Fast</tt></b>(</nobr></td><td>PyObject *<var>o</var>, const char *<var>m</var>)</td></tr></table></dt> | |
253 | <dd> | |
254 | <div class="refcount-info"> | |
255 | <span class="label">Return value:</span> | |
256 | <span class="value">New reference.</span> | |
257 | </div> | |
258 | Returns the sequence <var>o</var> as a tuple, unless it is already a | |
259 | tuple or list, in which case <var>o</var> is returned. Use | |
260 | <tt class="cfunction">PySequence_Fast_GET_ITEM()</tt> to access the members of the | |
261 | result. Returns <tt class="constant">NULL</tt> on failure. If the object is not a | |
262 | sequence, raises <tt class="exception">TypeError</tt> with <var>m</var> as the message | |
263 | text. | |
264 | </dd></dl> | |
265 | ||
266 | <P> | |
267 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject* <b><tt id='l2h-330' xml:id='l2h-330' class="cfunction">PySequence_Fast_GET_ITEM</tt></b>(</nobr></td><td>PyObject *<var>o</var>, int <var>i</var>)</td></tr></table></dt> | |
268 | <dd> | |
269 | <div class="refcount-info"> | |
270 | <span class="label">Return value:</span> | |
271 | <span class="value">Borrowed reference.</span> | |
272 | </div> | |
273 | Return the <var>i</var>th element of <var>o</var>, assuming that <var>o</var> was | |
274 | returned by <tt class="cfunction">PySequence_Fast()</tt>, <var>o</var> is not <tt class="constant">NULL</tt>, | |
275 | and that <var>i</var> is within bounds. | |
276 | </dd></dl> | |
277 | ||
278 | <P> | |
279 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject** <b><tt id='l2h-331' xml:id='l2h-331' class="cfunction">PySequence_Fast_ITEMS</tt></b>(</nobr></td><td>PyObject *<var>o</var>)</td></tr></table></dt> | |
280 | <dd> | |
281 | Return the underlying array of PyObject pointers. Assumes that | |
282 | <var>o</var> was returned by <tt class="cfunction">PySequence_Fast()</tt> and | |
283 | <var>o</var> is not <tt class="constant">NULL</tt>. | |
284 | ||
285 | <span class="versionnote">New in version 2.4.</span> | |
286 | ||
287 | </dd></dl> | |
288 | ||
289 | <P> | |
290 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject* <b><tt id='l2h-332' xml:id='l2h-332' class="cfunction">PySequence_ITEM</tt></b>(</nobr></td><td>PyObject *<var>o</var>, int <var>i</var>)</td></tr></table></dt> | |
291 | <dd> | |
292 | <div class="refcount-info"> | |
293 | <span class="label">Return value:</span> | |
294 | <span class="value">New reference.</span> | |
295 | </div> | |
296 | Return the <var>i</var>th element of <var>o</var> or <tt class="constant">NULL</tt> on failure. | |
297 | Macro form of <tt class="cfunction">PySequence_GetItem()</tt> but without checking | |
298 | that <tt class="cfunction">PySequence_Check(<var>o</var>)</tt> is true and without | |
299 | adjustment for negative indices. | |
300 | ||
301 | <span class="versionnote">New in version 2.3.</span> | |
302 | ||
303 | </dd></dl> | |
304 | ||
305 | <P> | |
306 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-333' xml:id='l2h-333' class="cfunction">PySequence_Fast_GET_SIZE</tt></b>(</nobr></td><td>PyObject *<var>o</var>)</td></tr></table></dt> | |
307 | <dd> | |
308 | Returns the length of <var>o</var>, assuming that <var>o</var> was | |
309 | returned by <tt class="cfunction">PySequence_Fast()</tt> and that <var>o</var> is | |
310 | not <tt class="constant">NULL</tt>. The size can also be gotten by calling | |
311 | <tt class="cfunction">PySequence_Size()</tt> on <var>o</var>, but | |
312 | <tt class="cfunction">PySequence_Fast_GET_SIZE()</tt> is faster because it can | |
313 | assume <var>o</var> is a list or tuple. | |
314 | </dd></dl> | |
315 | ||
316 | <P> | |
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352 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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