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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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