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  182.   <section id="module-xml.sax.saxutils">

  183. <span id="xml-sax-saxutils-sax-utilities"></span><h1><a class="reference internal" href="#module-xml.sax.saxutils" title="xml.sax.saxutils: Convenience functions and classes for use with SAX."><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.sax.saxutils</span></code></a> — SAX Utilities<a class="headerlink" href="#module-xml.sax.saxutils" title="Link to this heading">¶</a></h1>

  184. <p><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.12/Lib/xml/sax/saxutils.py">Lib/xml/sax/saxutils.py</a></p>

  185. <hr class="docutils" />

  186. <p>The module <a class="reference internal" href="#module-xml.sax.saxutils" title="xml.sax.saxutils: Convenience functions and classes for use with SAX."><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.sax.saxutils</span></code></a> contains a number of classes and functions

  187. that are commonly useful when creating SAX applications, either in direct use,

  188. or as base classes.</p>

  189. <dl class="py function">

  190. <dt class="sig sig-object py" id="xml.sax.saxutils.escape">

  191. <span class="sig-prename descclassname"><span class="pre">xml.sax.saxutils.</span></span><span class="sig-name descname"><span class="pre">escape</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">data</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">entities</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">{}</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.saxutils.escape" title="Link to this definition">¶</a></dt>

  192. <dd><p>Escape <code class="docutils literal notranslate"><span class="pre">'&amp;'</span></code>, <code class="docutils literal notranslate"><span class="pre">'&lt;'</span></code>, and <code class="docutils literal notranslate"><span class="pre">'&gt;'</span></code> in a string of data.</p>

  193. <p>You can escape other strings of data by passing a dictionary as the optional

  194. <em>entities</em> parameter.  The keys and values must all be strings; each key will be

  195. replaced with its corresponding value.  The characters <code class="docutils literal notranslate"><span class="pre">'&amp;'</span></code>, <code class="docutils literal notranslate"><span class="pre">'&lt;'</span></code> and

  196. <code class="docutils literal notranslate"><span class="pre">'&gt;'</span></code> are always escaped, even if <em>entities</em> is provided.</p>

  197. <div class="admonition note">

  198. <p class="admonition-title">Note</p>

  199. <p>This function should only be used to escape characters that

  200. can’t be used directly in XML. Do not use this function as a general

  201. string translation function.</p>

  202. </div>

  203. </dd></dl>

  204. 

  205. <dl class="py function">

  206. <dt class="sig sig-object py" id="xml.sax.saxutils.unescape">

  207. <span class="sig-prename descclassname"><span class="pre">xml.sax.saxutils.</span></span><span class="sig-name descname"><span class="pre">unescape</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">data</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">entities</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">{}</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.saxutils.unescape" title="Link to this definition">¶</a></dt>

  208. <dd><p>Unescape <code class="docutils literal notranslate"><span class="pre">'&amp;amp;'</span></code>, <code class="docutils literal notranslate"><span class="pre">'&amp;lt;'</span></code>, and <code class="docutils literal notranslate"><span class="pre">'&amp;gt;'</span></code> in a string of data.</p>

  209. <p>You can unescape other strings of data by passing a dictionary as the optional

  210. <em>entities</em> parameter.  The keys and values must all be strings; each key will be

  211. replaced with its corresponding value.  <code class="docutils literal notranslate"><span class="pre">'&amp;amp'</span></code>, <code class="docutils literal notranslate"><span class="pre">'&amp;lt;'</span></code>, and <code class="docutils literal notranslate"><span class="pre">'&amp;gt;'</span></code>

  212. are always unescaped, even if <em>entities</em> is provided.</p>

  213. </dd></dl>

  214. 

  215. <dl class="py function">

  216. <dt class="sig sig-object py" id="xml.sax.saxutils.quoteattr">

  217. <span class="sig-prename descclassname"><span class="pre">xml.sax.saxutils.</span></span><span class="sig-name descname"><span class="pre">quoteattr</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">data</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">entities</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">{}</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.saxutils.quoteattr" title="Link to this definition">¶</a></dt>

  218. <dd><p>Similar to <a class="reference internal" href="#xml.sax.saxutils.escape" title="xml.sax.saxutils.escape"><code class="xref py py-func docutils literal notranslate"><span class="pre">escape()</span></code></a>, but also prepares <em>data</em> to be used as an

  219. attribute value.  The return value is a quoted version of <em>data</em> with any

  220. additional required replacements. <a class="reference internal" href="#xml.sax.saxutils.quoteattr" title="xml.sax.saxutils.quoteattr"><code class="xref py py-func docutils literal notranslate"><span class="pre">quoteattr()</span></code></a> will select a quote

  221. character based on the content of <em>data</em>, attempting to avoid encoding any

  222. quote characters in the string.  If both single- and double-quote characters

  223. are already in <em>data</em>, the double-quote characters will be encoded and <em>data</em>

  224. will be wrapped in double-quotes.  The resulting string can be used directly

  225. as an attribute value:</p>

  226. <div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="nb">print</span><span class="p">(</span><span class="s2">&quot;&lt;element attr=</span><span class="si">%s</span><span class="s2">&gt;&quot;</span> <span class="o">%</span> <span class="n">quoteattr</span><span class="p">(</span><span class="s2">&quot;ab &#39; cd </span><span class="se">\&quot;</span><span class="s2"> ef&quot;</span><span class="p">))</span>

  227. <span class="go">&lt;element attr=&quot;ab &#39; cd &amp;quot; ef&quot;&gt;</span>

  228. </pre></div>

  229. </div>

  230. <p>This function is useful when generating attribute values for HTML or any SGML

  231. using the reference concrete syntax.</p>

  232. </dd></dl>

  233. 

  234. <dl class="py class">

  235. <dt class="sig sig-object py" id="xml.sax.saxutils.XMLGenerator">

  236. <em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">xml.sax.saxutils.</span></span><span class="sig-name descname"><span class="pre">XMLGenerator</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">out</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">encoding</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">'iso-8859-1'</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">short_empty_elements</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">False</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.saxutils.XMLGenerator" title="Link to this definition">¶</a></dt>

  237. <dd><p>This class implements the <a class="reference internal" href="xml.sax.handler.html#xml.sax.handler.ContentHandler" title="xml.sax.handler.ContentHandler"><code class="xref py py-class docutils literal notranslate"><span class="pre">ContentHandler</span></code></a> interface

  238. by writing SAX

  239. events back into an XML document. In other words, using an <a class="reference internal" href="#xml.sax.saxutils.XMLGenerator" title="xml.sax.saxutils.XMLGenerator"><code class="xref py py-class docutils literal notranslate"><span class="pre">XMLGenerator</span></code></a>

  240. as the content handler will reproduce the original document being parsed. <em>out</em>

  241. should be a file-like object which will default to <em>sys.stdout</em>. <em>encoding</em> is

  242. the encoding of the output stream which defaults to <code class="docutils literal notranslate"><span class="pre">'iso-8859-1'</span></code>.

  243. <em>short_empty_elements</em> controls the formatting of elements that contain no

  244. content:  if <code class="docutils literal notranslate"><span class="pre">False</span></code> (the default) they are emitted as a pair of start/end

  245. tags, if set to <code class="docutils literal notranslate"><span class="pre">True</span></code> they are emitted as a single self-closed tag.</p>

  246. <div class="versionchanged">

  247. <p><span class="versionmodified changed">Changed in version 3.2: </span>Added the <em>short_empty_elements</em> parameter.</p>

  248. </div>

  249. </dd></dl>

  250. 

  251. <dl class="py class">

  252. <dt class="sig sig-object py" id="xml.sax.saxutils.XMLFilterBase">

  253. <em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">xml.sax.saxutils.</span></span><span class="sig-name descname"><span class="pre">XMLFilterBase</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">base</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.saxutils.XMLFilterBase" title="Link to this definition">¶</a></dt>

  254. <dd><p>This class is designed to sit between an

  255. <a class="reference internal" href="xml.sax.reader.html#xml.sax.xmlreader.XMLReader" title="xml.sax.xmlreader.XMLReader"><code class="xref py py-class docutils literal notranslate"><span class="pre">XMLReader</span></code></a> and the client

  256. application’s event handlers.  By default, it does nothing but pass requests up

  257. to the reader and events on to the handlers unmodified, but subclasses can

  258. override specific methods to modify the event stream or the configuration

  259. requests as they pass through.</p>

  260. </dd></dl>

  261. 

  262. <dl class="py function">

  263. <dt class="sig sig-object py" id="xml.sax.saxutils.prepare_input_source">

  264. <span class="sig-prename descclassname"><span class="pre">xml.sax.saxutils.</span></span><span class="sig-name descname"><span class="pre">prepare_input_source</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">source</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">base</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">''</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.saxutils.prepare_input_source" title="Link to this definition">¶</a></dt>

  265. <dd><p>This function takes an input source and an optional base URL and returns a

  266. fully resolved <a class="reference internal" href="xml.sax.reader.html#xml.sax.xmlreader.InputSource" title="xml.sax.xmlreader.InputSource"><code class="xref py py-class docutils literal notranslate"><span class="pre">InputSource</span></code></a> object ready for

  267. reading.  The input source can be given as a string, a file-like object, or

  268. an <a class="reference internal" href="xml.sax.reader.html#xml.sax.xmlreader.InputSource" title="xml.sax.xmlreader.InputSource"><code class="xref py py-class docutils literal notranslate"><span class="pre">InputSource</span></code></a> object; parsers will use this

  269. function to implement the polymorphic <em>source</em> argument to their

  270. <a class="reference internal" href="xml.sax.reader.html#xml.sax.xmlreader.XMLReader.parse" title="xml.sax.xmlreader.XMLReader.parse"><code class="xref py py-meth docutils literal notranslate"><span class="pre">parse()</span></code></a> method.</p>

  271. </dd></dl>

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