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  <section id="module-stringprep">
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<span id="stringprep-internet-string-preparation"></span><h1><code class="xref py py-mod docutils literal notranslate"><span class="pre">stringprep</span></code> — Internet String Preparation<a class="headerlink" href="#module-stringprep" title="Link to this heading">¶</a></h1>
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<p><strong>Source code:</strong> <a class="extlink-source reference external" href="https://github.com/python/cpython/tree/3.13/Lib/stringprep.py">Lib/stringprep.py</a></p>
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<hr class="docutils" />
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<p>When identifying things (such as host names) in the internet, it is often
 | 
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necessary to compare such identifications for “equality”. Exactly how this
 | 
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comparison is executed may depend on the application domain, e.g. whether it
 | 
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should be case-insensitive or not. It may be also necessary to restrict the
 | 
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possible identifications, to allow only identifications consisting of
 | 
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“printable” characters.</p>
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<p><span class="target" id="index-0"></span><a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc3454.html"><strong>RFC 3454</strong></a> defines a procedure for “preparing” Unicode strings in internet
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protocols. Before passing strings onto the wire, they are processed with the
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preparation procedure, after which they have a certain normalized form. The RFC
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defines a set of tables, which can be combined into profiles. Each profile must
 | 
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define which tables it uses, and what other optional parts of the <code class="docutils literal notranslate"><span class="pre">stringprep</span></code>
 | 
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procedure are part of the profile. One example of a <code class="docutils literal notranslate"><span class="pre">stringprep</span></code> profile is
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<code class="docutils literal notranslate"><span class="pre">nameprep</span></code>, which is used for internationalized domain names.</p>
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<p>The module <a class="reference internal" href="#module-stringprep" title="stringprep: String preparation, as per RFC 3453"><code class="xref py py-mod docutils literal notranslate"><span class="pre">stringprep</span></code></a> only exposes the tables from <span class="target" id="index-1"></span><a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc3454.html"><strong>RFC 3454</strong></a>. As these
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tables would be very large to represent as dictionaries or lists, the
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module uses the Unicode character database internally. The module source code
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itself was generated using the <code class="docutils literal notranslate"><span class="pre">mkstringprep.py</span></code> utility.</p>
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<p>As a result, these tables are exposed as functions, not as data structures.
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There are two kinds of tables in the RFC: sets and mappings. For a set,
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<a class="reference internal" href="#module-stringprep" title="stringprep: String preparation, as per RFC 3453"><code class="xref py py-mod docutils literal notranslate"><span class="pre">stringprep</span></code></a> provides the “characteristic function”, i.e. a function that
 | 
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returns <code class="docutils literal notranslate"><span class="pre">True</span></code> if the parameter is part of the set. For mappings, it provides the
 | 
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mapping function: given the key, it returns the associated value. Below is a
 | 
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list of all functions available in the module.</p>
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<dl class="py function">
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<dt class="sig sig-object py" id="stringprep.in_table_a1">
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<span class="sig-prename descclassname"><span class="pre">stringprep.</span></span><span class="sig-name descname"><span class="pre">in_table_a1</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_a1" title="Link to this definition">¶</a></dt>
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<dd><p>Determine whether <em>code</em> is in tableA.1 (Unassigned code points in Unicode 3.2).</p>
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</dd></dl>
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<dl class="py function">
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<dt class="sig sig-object py" id="stringprep.in_table_b1">
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<span class="sig-prename descclassname"><span class="pre">stringprep.</span></span><span class="sig-name descname"><span class="pre">in_table_b1</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_b1" title="Link to this definition">¶</a></dt>
 | 
						|
<dd><p>Determine whether <em>code</em> is in tableB.1 (Commonly mapped to nothing).</p>
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</dd></dl>
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<dl class="py function">
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<dt class="sig sig-object py" id="stringprep.map_table_b2">
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<span class="sig-prename descclassname"><span class="pre">stringprep.</span></span><span class="sig-name descname"><span class="pre">map_table_b2</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.map_table_b2" title="Link to this definition">¶</a></dt>
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<dd><p>Return the mapped value for <em>code</em> according to tableB.2 (Mapping for
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						|
case-folding used with NFKC).</p>
 | 
						|
</dd></dl>
 | 
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<dl class="py function">
 | 
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<dt class="sig sig-object py" id="stringprep.map_table_b3">
 | 
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<span class="sig-prename descclassname"><span class="pre">stringprep.</span></span><span class="sig-name descname"><span class="pre">map_table_b3</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.map_table_b3" title="Link to this definition">¶</a></dt>
 | 
						|
<dd><p>Return the mapped value for <em>code</em> according to tableB.3 (Mapping for
 | 
						|
case-folding used with no normalization).</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="py function">
 | 
						|
<dt class="sig sig-object py" id="stringprep.in_table_c11">
 | 
						|
<span class="sig-prename descclassname"><span class="pre">stringprep.</span></span><span class="sig-name descname"><span class="pre">in_table_c11</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c11" title="Link to this definition">¶</a></dt>
 | 
						|
<dd><p>Determine whether <em>code</em> is in tableC.1.1  (ASCII space characters).</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="py function">
 | 
						|
<dt class="sig sig-object py" id="stringprep.in_table_c12">
 | 
						|
<span class="sig-prename descclassname"><span class="pre">stringprep.</span></span><span class="sig-name descname"><span class="pre">in_table_c12</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c12" title="Link to this definition">¶</a></dt>
 | 
						|
<dd><p>Determine whether <em>code</em> is in tableC.1.2  (Non-ASCII space characters).</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="py function">
 | 
						|
<dt class="sig sig-object py" id="stringprep.in_table_c11_c12">
 | 
						|
<span class="sig-prename descclassname"><span class="pre">stringprep.</span></span><span class="sig-name descname"><span class="pre">in_table_c11_c12</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c11_c12" title="Link to this definition">¶</a></dt>
 | 
						|
<dd><p>Determine whether <em>code</em> is in tableC.1  (Space characters, union of C.1.1 and
 | 
						|
C.1.2).</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="py function">
 | 
						|
<dt class="sig sig-object py" id="stringprep.in_table_c21">
 | 
						|
<span class="sig-prename descclassname"><span class="pre">stringprep.</span></span><span class="sig-name descname"><span class="pre">in_table_c21</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c21" title="Link to this definition">¶</a></dt>
 | 
						|
<dd><p>Determine whether <em>code</em> is in tableC.2.1  (ASCII control characters).</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="py function">
 | 
						|
<dt class="sig sig-object py" id="stringprep.in_table_c22">
 | 
						|
<span class="sig-prename descclassname"><span class="pre">stringprep.</span></span><span class="sig-name descname"><span class="pre">in_table_c22</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c22" title="Link to this definition">¶</a></dt>
 | 
						|
<dd><p>Determine whether <em>code</em> is in tableC.2.2  (Non-ASCII control characters).</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="py function">
 | 
						|
<dt class="sig sig-object py" id="stringprep.in_table_c21_c22">
 | 
						|
<span class="sig-prename descclassname"><span class="pre">stringprep.</span></span><span class="sig-name descname"><span class="pre">in_table_c21_c22</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c21_c22" title="Link to this definition">¶</a></dt>
 | 
						|
<dd><p>Determine whether <em>code</em> is in tableC.2  (Control characters, union of C.2.1 and
 | 
						|
C.2.2).</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="py function">
 | 
						|
<dt class="sig sig-object py" id="stringprep.in_table_c3">
 | 
						|
<span class="sig-prename descclassname"><span class="pre">stringprep.</span></span><span class="sig-name descname"><span class="pre">in_table_c3</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c3" title="Link to this definition">¶</a></dt>
 | 
						|
<dd><p>Determine whether <em>code</em> is in tableC.3  (Private use).</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="py function">
 | 
						|
<dt class="sig sig-object py" id="stringprep.in_table_c4">
 | 
						|
<span class="sig-prename descclassname"><span class="pre">stringprep.</span></span><span class="sig-name descname"><span class="pre">in_table_c4</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c4" title="Link to this definition">¶</a></dt>
 | 
						|
<dd><p>Determine whether <em>code</em> is in tableC.4  (Non-character code points).</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="py function">
 | 
						|
<dt class="sig sig-object py" id="stringprep.in_table_c5">
 | 
						|
<span class="sig-prename descclassname"><span class="pre">stringprep.</span></span><span class="sig-name descname"><span class="pre">in_table_c5</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c5" title="Link to this definition">¶</a></dt>
 | 
						|
<dd><p>Determine whether <em>code</em> is in tableC.5  (Surrogate codes).</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="py function">
 | 
						|
<dt class="sig sig-object py" id="stringprep.in_table_c6">
 | 
						|
<span class="sig-prename descclassname"><span class="pre">stringprep.</span></span><span class="sig-name descname"><span class="pre">in_table_c6</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c6" title="Link to this definition">¶</a></dt>
 | 
						|
<dd><p>Determine whether <em>code</em> is in tableC.6  (Inappropriate for plain text).</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="py function">
 | 
						|
<dt class="sig sig-object py" id="stringprep.in_table_c7">
 | 
						|
<span class="sig-prename descclassname"><span class="pre">stringprep.</span></span><span class="sig-name descname"><span class="pre">in_table_c7</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c7" title="Link to this definition">¶</a></dt>
 | 
						|
<dd><p>Determine whether <em>code</em> is in tableC.7  (Inappropriate for canonical
 | 
						|
representation).</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="py function">
 | 
						|
<dt class="sig sig-object py" id="stringprep.in_table_c8">
 | 
						|
<span class="sig-prename descclassname"><span class="pre">stringprep.</span></span><span class="sig-name descname"><span class="pre">in_table_c8</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c8" title="Link to this definition">¶</a></dt>
 | 
						|
<dd><p>Determine whether <em>code</em> is in tableC.8  (Change display properties or are
 | 
						|
deprecated).</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="py function">
 | 
						|
<dt class="sig sig-object py" id="stringprep.in_table_c9">
 | 
						|
<span class="sig-prename descclassname"><span class="pre">stringprep.</span></span><span class="sig-name descname"><span class="pre">in_table_c9</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c9" title="Link to this definition">¶</a></dt>
 | 
						|
<dd><p>Determine whether <em>code</em> is in tableC.9  (Tagging characters).</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="py function">
 | 
						|
<dt class="sig sig-object py" id="stringprep.in_table_d1">
 | 
						|
<span class="sig-prename descclassname"><span class="pre">stringprep.</span></span><span class="sig-name descname"><span class="pre">in_table_d1</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_d1" title="Link to this definition">¶</a></dt>
 | 
						|
<dd><p>Determine whether <em>code</em> is in tableD.1  (Characters with bidirectional property
 | 
						|
“R” or “AL”).</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
						|
<dl class="py function">
 | 
						|
<dt class="sig sig-object py" id="stringprep.in_table_d2">
 | 
						|
<span class="sig-prename descclassname"><span class="pre">stringprep.</span></span><span class="sig-name descname"><span class="pre">in_table_d2</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">code</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_d2" title="Link to this definition">¶</a></dt>
 | 
						|
<dd><p>Determine whether <em>code</em> is in tableD.2  (Characters with bidirectional property
 | 
						|
“L”).</p>
 | 
						|
</dd></dl>
 | 
						|
 | 
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