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55 | <H2><A NAME="SECTION009320000000000000000"></A><A NAME="unicodeObjects"></A> | |
56 | <BR> | |
57 | 7.3.2 Unicode Objects | |
58 | </H2> | |
59 | ||
60 | <P> | |
61 | These are the basic Unicode object types used for the Unicode | |
62 | implementation in Python: | |
63 | ||
64 | <P> | |
65 | <dl><dt><b><tt class="ctype"><a id='l2h-474' xml:id='l2h-474'>Py_UNICODE</a></tt></b></dt> | |
66 | <dd> | |
67 | This type represents a 16-bit unsigned storage type which is used by | |
68 | Python internally as basis for holding Unicode ordinals. On | |
69 | platforms where <tt class="ctype">wchar_t</tt> is available and also has 16-bits, | |
70 | <tt class="ctype">Py_UNICODE</tt> is a typedef alias for <tt class="ctype">wchar_t</tt> to enhance | |
71 | native platform compatibility. On all other platforms, | |
72 | <tt class="ctype">Py_UNICODE</tt> is a typedef alias for <tt class="ctype">unsigned short</tt>. | |
73 | </dl> | |
74 | ||
75 | <P> | |
76 | <dl><dt><b><tt class="ctype"><a id='l2h-475' xml:id='l2h-475'>PyUnicodeObject</a></tt></b></dt> | |
77 | <dd> | |
78 | This subtype of <tt class="ctype">PyObject</tt> represents a Python Unicode object. | |
79 | </dl> | |
80 | ||
81 | <P> | |
82 | <dl><dt>PyTypeObject <b><tt id='l2h-476' xml:id='l2h-476' class="cdata">PyUnicode_Type</tt></b></dt> | |
83 | <dd> | |
84 | This instance of <tt class="ctype">PyTypeObject</tt> represents the Python Unicode | |
85 | type. | |
86 | </dd></dl> | |
87 | ||
88 | <P> | |
89 | The following APIs are really C macros and can be used to do fast | |
90 | checks and to access internal read-only data of Unicode objects: | |
91 | ||
92 | <P> | |
93 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-477' xml:id='l2h-477' class="cfunction">PyUnicode_Check</tt></b>(</nobr></td><td>PyObject *<var>o</var>)</td></tr></table></dt> | |
94 | <dd> | |
95 | Return true if the object <var>o</var> is a Unicode object or an | |
96 | instance of a Unicode subtype. | |
97 | ||
98 | <span class="versionnote">Changed in version 2.2: | |
99 | Allowed subtypes to be accepted.</span> | |
100 | ||
101 | </dd></dl> | |
102 | ||
103 | <P> | |
104 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-478' xml:id='l2h-478' class="cfunction">PyUnicode_CheckExact</tt></b>(</nobr></td><td>PyObject *<var>o</var>)</td></tr></table></dt> | |
105 | <dd> | |
106 | Return true if the object <var>o</var> is a Unicode object, but not an | |
107 | instance of a subtype. | |
108 | ||
109 | <span class="versionnote">New in version 2.2.</span> | |
110 | ||
111 | </dd></dl> | |
112 | ||
113 | <P> | |
114 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-479' xml:id='l2h-479' class="cfunction">PyUnicode_GET_SIZE</tt></b>(</nobr></td><td>PyObject *<var>o</var>)</td></tr></table></dt> | |
115 | <dd> | |
116 | Return the size of the object. <var>o</var> has to be a | |
117 | <tt class="ctype">PyUnicodeObject</tt> (not checked). | |
118 | </dd></dl> | |
119 | ||
120 | <P> | |
121 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-480' xml:id='l2h-480' class="cfunction">PyUnicode_GET_DATA_SIZE</tt></b>(</nobr></td><td>PyObject *<var>o</var>)</td></tr></table></dt> | |
122 | <dd> | |
123 | Return the size of the object's internal buffer in bytes. <var>o</var> | |
124 | has to be a <tt class="ctype">PyUnicodeObject</tt> (not checked). | |
125 | </dd></dl> | |
126 | ||
127 | <P> | |
128 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>Py_UNICODE* <b><tt id='l2h-481' xml:id='l2h-481' class="cfunction">PyUnicode_AS_UNICODE</tt></b>(</nobr></td><td>PyObject *<var>o</var>)</td></tr></table></dt> | |
129 | <dd> | |
130 | Return a pointer to the internal <tt class="ctype">Py_UNICODE</tt> buffer of the | |
131 | object. <var>o</var> has to be a <tt class="ctype">PyUnicodeObject</tt> (not checked). | |
132 | </dd></dl> | |
133 | ||
134 | <P> | |
135 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>const char* <b><tt id='l2h-482' xml:id='l2h-482' class="cfunction">PyUnicode_AS_DATA</tt></b>(</nobr></td><td>PyObject *<var>o</var>)</td></tr></table></dt> | |
136 | <dd> | |
137 | Return a pointer to the internal buffer of the object. | |
138 | <var>o</var> has to be a <tt class="ctype">PyUnicodeObject</tt> (not checked). | |
139 | </dd></dl> | |
140 | ||
141 | <P> | |
142 | Unicode provides many different character properties. The most often | |
143 | needed ones are available through these macros which are mapped to C | |
144 | functions depending on the Python configuration. | |
145 | ||
146 | <P> | |
147 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-483' xml:id='l2h-483' class="cfunction">Py_UNICODE_ISSPACE</tt></b>(</nobr></td><td>Py_UNICODE <var>ch</var>)</td></tr></table></dt> | |
148 | <dd> | |
149 | Return 1 or 0 depending on whether <var>ch</var> is a whitespace | |
150 | character. | |
151 | </dd></dl> | |
152 | ||
153 | <P> | |
154 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-484' xml:id='l2h-484' class="cfunction">Py_UNICODE_ISLOWER</tt></b>(</nobr></td><td>Py_UNICODE <var>ch</var>)</td></tr></table></dt> | |
155 | <dd> | |
156 | Return 1 or 0 depending on whether <var>ch</var> is a lowercase character. | |
157 | </dd></dl> | |
158 | ||
159 | <P> | |
160 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-485' xml:id='l2h-485' class="cfunction">Py_UNICODE_ISUPPER</tt></b>(</nobr></td><td>Py_UNICODE <var>ch</var>)</td></tr></table></dt> | |
161 | <dd> | |
162 | Return 1 or 0 depending on whether <var>ch</var> is an uppercase | |
163 | character. | |
164 | </dd></dl> | |
165 | ||
166 | <P> | |
167 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-486' xml:id='l2h-486' class="cfunction">Py_UNICODE_ISTITLE</tt></b>(</nobr></td><td>Py_UNICODE <var>ch</var>)</td></tr></table></dt> | |
168 | <dd> | |
169 | Return 1 or 0 depending on whether <var>ch</var> is a titlecase character. | |
170 | </dd></dl> | |
171 | ||
172 | <P> | |
173 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-487' xml:id='l2h-487' class="cfunction">Py_UNICODE_ISLINEBREAK</tt></b>(</nobr></td><td>Py_UNICODE <var>ch</var>)</td></tr></table></dt> | |
174 | <dd> | |
175 | Return 1 or 0 depending on whether <var>ch</var> is a linebreak character. | |
176 | </dd></dl> | |
177 | ||
178 | <P> | |
179 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-488' xml:id='l2h-488' class="cfunction">Py_UNICODE_ISDECIMAL</tt></b>(</nobr></td><td>Py_UNICODE <var>ch</var>)</td></tr></table></dt> | |
180 | <dd> | |
181 | Return 1 or 0 depending on whether <var>ch</var> is a decimal character. | |
182 | </dd></dl> | |
183 | ||
184 | <P> | |
185 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-489' xml:id='l2h-489' class="cfunction">Py_UNICODE_ISDIGIT</tt></b>(</nobr></td><td>Py_UNICODE <var>ch</var>)</td></tr></table></dt> | |
186 | <dd> | |
187 | Return 1 or 0 depending on whether <var>ch</var> is a digit character. | |
188 | </dd></dl> | |
189 | ||
190 | <P> | |
191 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-490' xml:id='l2h-490' class="cfunction">Py_UNICODE_ISNUMERIC</tt></b>(</nobr></td><td>Py_UNICODE <var>ch</var>)</td></tr></table></dt> | |
192 | <dd> | |
193 | Return 1 or 0 depending on whether <var>ch</var> is a numeric character. | |
194 | </dd></dl> | |
195 | ||
196 | <P> | |
197 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-491' xml:id='l2h-491' class="cfunction">Py_UNICODE_ISALPHA</tt></b>(</nobr></td><td>Py_UNICODE <var>ch</var>)</td></tr></table></dt> | |
198 | <dd> | |
199 | Return 1 or 0 depending on whether <var>ch</var> is an alphabetic | |
200 | character. | |
201 | </dd></dl> | |
202 | ||
203 | <P> | |
204 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-492' xml:id='l2h-492' class="cfunction">Py_UNICODE_ISALNUM</tt></b>(</nobr></td><td>Py_UNICODE <var>ch</var>)</td></tr></table></dt> | |
205 | <dd> | |
206 | Return 1 or 0 depending on whether <var>ch</var> is an alphanumeric | |
207 | character. | |
208 | </dd></dl> | |
209 | ||
210 | <P> | |
211 | These APIs can be used for fast direct character conversions: | |
212 | ||
213 | <P> | |
214 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>Py_UNICODE <b><tt id='l2h-493' xml:id='l2h-493' class="cfunction">Py_UNICODE_TOLOWER</tt></b>(</nobr></td><td>Py_UNICODE <var>ch</var>)</td></tr></table></dt> | |
215 | <dd> | |
216 | Return the character <var>ch</var> converted to lower case. | |
217 | </dd></dl> | |
218 | ||
219 | <P> | |
220 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>Py_UNICODE <b><tt id='l2h-494' xml:id='l2h-494' class="cfunction">Py_UNICODE_TOUPPER</tt></b>(</nobr></td><td>Py_UNICODE <var>ch</var>)</td></tr></table></dt> | |
221 | <dd> | |
222 | Return the character <var>ch</var> converted to upper case. | |
223 | </dd></dl> | |
224 | ||
225 | <P> | |
226 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>Py_UNICODE <b><tt id='l2h-495' xml:id='l2h-495' class="cfunction">Py_UNICODE_TOTITLE</tt></b>(</nobr></td><td>Py_UNICODE <var>ch</var>)</td></tr></table></dt> | |
227 | <dd> | |
228 | Return the character <var>ch</var> converted to title case. | |
229 | </dd></dl> | |
230 | ||
231 | <P> | |
232 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-496' xml:id='l2h-496' class="cfunction">Py_UNICODE_TODECIMAL</tt></b>(</nobr></td><td>Py_UNICODE <var>ch</var>)</td></tr></table></dt> | |
233 | <dd> | |
234 | Return the character <var>ch</var> converted to a decimal positive | |
235 | integer. Return <code>-1</code> if this is not possible. This macro | |
236 | does not raise exceptions. | |
237 | </dd></dl> | |
238 | ||
239 | <P> | |
240 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-497' xml:id='l2h-497' class="cfunction">Py_UNICODE_TODIGIT</tt></b>(</nobr></td><td>Py_UNICODE <var>ch</var>)</td></tr></table></dt> | |
241 | <dd> | |
242 | Return the character <var>ch</var> converted to a single digit integer. | |
243 | Return <code>-1</code> if this is not possible. This macro does not raise | |
244 | exceptions. | |
245 | </dd></dl> | |
246 | ||
247 | <P> | |
248 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>double <b><tt id='l2h-498' xml:id='l2h-498' class="cfunction">Py_UNICODE_TONUMERIC</tt></b>(</nobr></td><td>Py_UNICODE <var>ch</var>)</td></tr></table></dt> | |
249 | <dd> | |
250 | Return the character <var>ch</var> converted to a (positive) double. | |
251 | Return <code>-1.0</code> if this is not possible. This macro does not raise | |
252 | exceptions. | |
253 | </dd></dl> | |
254 | ||
255 | <P> | |
256 | To create Unicode objects and access their basic sequence properties, | |
257 | use these APIs: | |
258 | ||
259 | <P> | |
260 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject* <b><tt id='l2h-499' xml:id='l2h-499' class="cfunction">PyUnicode_FromUnicode</tt></b>(</nobr></td><td>const Py_UNICODE *<var>u</var>, | |
261 | int <var>size</var>)</td></tr></table></dt> | |
262 | <dd> | |
263 | <div class="refcount-info"> | |
264 | <span class="label">Return value:</span> | |
265 | <span class="value">New reference.</span> | |
266 | </div> | |
267 | Create a Unicode Object from the Py_UNICODE buffer <var>u</var> of the | |
268 | given size. <var>u</var> may be <tt class="constant">NULL</tt> which causes the contents to be | |
269 | undefined. It is the user's responsibility to fill in the needed | |
270 | data. The buffer is copied into the new object. If the buffer is | |
271 | not <tt class="constant">NULL</tt>, the return value might be a shared object. Therefore, | |
272 | modification of the resulting Unicode object is only allowed when | |
273 | <var>u</var> is <tt class="constant">NULL</tt>. | |
274 | </dd></dl> | |
275 | ||
276 | <P> | |
277 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>Py_UNICODE* <b><tt id='l2h-500' xml:id='l2h-500' class="cfunction">PyUnicode_AsUnicode</tt></b>(</nobr></td><td>PyObject *<var>unicode</var>)</td></tr></table></dt> | |
278 | <dd> | |
279 | Return a read-only pointer to the Unicode object's internal | |
280 | <tt class="ctype">Py_UNICODE</tt> buffer, <tt class="constant">NULL</tt> if <var>unicode</var> is not a Unicode | |
281 | object. | |
282 | </dd></dl> | |
283 | ||
284 | <P> | |
285 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-501' xml:id='l2h-501' class="cfunction">PyUnicode_GetSize</tt></b>(</nobr></td><td>PyObject *<var>unicode</var>)</td></tr></table></dt> | |
286 | <dd> | |
287 | Return the length of the Unicode object. | |
288 | </dd></dl> | |
289 | ||
290 | <P> | |
291 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject* <b><tt id='l2h-502' xml:id='l2h-502' class="cfunction">PyUnicode_FromEncodedObject</tt></b>(</nobr></td><td>PyObject *<var>obj</var>, | |
292 | const char *<var>encoding</var>, | |
293 | const char *<var>errors</var>)</td></tr></table></dt> | |
294 | <dd> | |
295 | <div class="refcount-info"> | |
296 | <span class="label">Return value:</span> | |
297 | <span class="value">New reference.</span> | |
298 | </div> | |
299 | Coerce an encoded object <var>obj</var> to an Unicode object and return a | |
300 | reference with incremented refcount. | |
301 | ||
302 | <P> | |
303 | Coercion is done in the following way: | |
304 | ||
305 | <P> | |
306 | ||
307 | <OL> | |
308 | <LI>Unicode objects are passed back as-is with incremented | |
309 | refcount. <span class="note"><b class="label">Note:</b> | |
310 | These cannot be decoded; passing a non-<tt class="constant">NULL</tt> | |
311 | value for encoding will result in a <tt class="exception">TypeError</tt>.</span> | |
312 | ||
313 | <P> | |
314 | </LI> | |
315 | <LI>String and other char buffer compatible objects are decoded | |
316 | according to the given encoding and using the error handling | |
317 | defined by errors. Both can be <tt class="constant">NULL</tt> to have the interface | |
318 | use the default values (see the next section for details). | |
319 | ||
320 | <P> | |
321 | </LI> | |
322 | <LI>All other objects cause an exception. | |
323 | </LI> | |
324 | </OL> | |
325 | ||
326 | <P> | |
327 | The API returns <tt class="constant">NULL</tt> if there was an error. The caller is | |
328 | responsible for decref'ing the returned objects. | |
329 | </dd></dl> | |
330 | ||
331 | <P> | |
332 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject* <b><tt id='l2h-503' xml:id='l2h-503' class="cfunction">PyUnicode_FromObject</tt></b>(</nobr></td><td>PyObject *<var>obj</var>)</td></tr></table></dt> | |
333 | <dd> | |
334 | <div class="refcount-info"> | |
335 | <span class="label">Return value:</span> | |
336 | <span class="value">New reference.</span> | |
337 | </div> | |
338 | Shortcut for <code>PyUnicode_FromEncodedObject(obj, NULL, "strict")</code> | |
339 | which is used throughout the interpreter whenever coercion to | |
340 | Unicode is needed. | |
341 | </dd></dl> | |
342 | ||
343 | <P> | |
344 | If the platform supports <tt class="ctype">wchar_t</tt> and provides a header file | |
345 | wchar.h, Python can interface directly to this type using the | |
346 | following functions. Support is optimized if Python's own | |
347 | <tt class="ctype">Py_UNICODE</tt> type is identical to the system's <tt class="ctype">wchar_t</tt>. | |
348 | ||
349 | <P> | |
350 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject* <b><tt id='l2h-504' xml:id='l2h-504' class="cfunction">PyUnicode_FromWideChar</tt></b>(</nobr></td><td>const wchar_t *<var>w</var>, | |
351 | int <var>size</var>)</td></tr></table></dt> | |
352 | <dd> | |
353 | <div class="refcount-info"> | |
354 | <span class="label">Return value:</span> | |
355 | <span class="value">New reference.</span> | |
356 | </div> | |
357 | Create a Unicode object from the <tt class="ctype">wchar_t</tt> buffer <var>w</var> of | |
358 | the given size. Return <tt class="constant">NULL</tt> on failure. | |
359 | </dd></dl> | |
360 | ||
361 | <P> | |
362 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-505' xml:id='l2h-505' class="cfunction">PyUnicode_AsWideChar</tt></b>(</nobr></td><td>PyUnicodeObject *<var>unicode</var>, | |
363 | wchar_t *<var>w</var>, | |
364 | int <var>size</var>)</td></tr></table></dt> | |
365 | <dd> | |
366 | Copy the Unicode object contents into the <tt class="ctype">wchar_t</tt> buffer | |
367 | <var>w</var>. At most <var>size</var> <tt class="ctype">wchar_t</tt> characters are copied | |
368 | (excluding a possibly trailing 0-termination character). Return | |
369 | the number of <tt class="ctype">wchar_t</tt> characters copied or -1 in case of an | |
370 | error. Note that the resulting <tt class="ctype">wchar_t</tt> string may or may | |
371 | not be 0-terminated. It is the responsibility of the caller to make | |
372 | sure that the <tt class="ctype">wchar_t</tt> string is 0-terminated in case this is | |
373 | required by the application. | |
374 | </dd></dl> | |
375 | ||
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424 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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