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  <div class="section" id="module-stdnum.casrn">
<span id="stdnum-casrn"></span><h1>stdnum.casrn<a class="headerlink" href="#module-stdnum.casrn" title="Permalink to this headline"></a></h1>
<p>CAS RN (Chemical Abstracts Service Registry Number).</p>
<p>The CAS Registry Number is a unique identifier assigned by the Chemical
Abstracts Service (CAS) to a chemical substance.</p>
<p>More information:</p>
<ul class="simple">
<li><a class="reference external" href="https://en.wikipedia.org/wiki/CAS_Registry_Number">https://en.wikipedia.org/wiki/CAS_Registry_Number</a></li>
</ul>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">validate</span><span class="p">(</span><span class="s1">&#39;87-86-5&#39;</span><span class="p">)</span>
<span class="go">&#39;87-86-5&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">validate</span><span class="p">(</span><span class="s1">&#39;87-86-6&#39;</span><span class="p">)</span>
<span class="gt">Traceback (most recent call last):</span>
    <span class="o">...</span>
<span class="gr">InvalidChecksum</span>: <span class="n">...</span>
</pre></div>
</div>
<dl class="function">
<dt id="stdnum.casrn.calc_check_digit">
<code class="descclassname">stdnum.casrn.</code><code class="descname">calc_check_digit</code><span class="sig-paren">(</span><em>number</em><span class="sig-paren">)</span><a class="headerlink" href="#stdnum.casrn.calc_check_digit" title="Permalink to this definition"></a></dt>
<dd><p>Calculate the check digit for the number. The passed number should not
have the check digit included.</p>
</dd></dl>

<dl class="function">
<dt id="stdnum.casrn.compact">
<code class="descclassname">stdnum.casrn.</code><code class="descname">compact</code><span class="sig-paren">(</span><em>number</em><span class="sig-paren">)</span><a class="headerlink" href="#stdnum.casrn.compact" title="Permalink to this definition"></a></dt>
<dd><p>Convert the number to the minimal representation.</p>
</dd></dl>

<dl class="function">
<dt id="stdnum.casrn.is_valid">
<code class="descclassname">stdnum.casrn.</code><code class="descname">is_valid</code><span class="sig-paren">(</span><em>number</em><span class="sig-paren">)</span><a class="headerlink" href="#stdnum.casrn.is_valid" title="Permalink to this definition"></a></dt>
<dd><p>Check if the number provided is a valid CAS RN.</p>
</dd></dl>

<dl class="function">
<dt id="stdnum.casrn.validate">
<code class="descclassname">stdnum.casrn.</code><code class="descname">validate</code><span class="sig-paren">(</span><em>number</em><span class="sig-paren">)</span><a class="headerlink" href="#stdnum.casrn.validate" title="Permalink to this definition"></a></dt>
<dd><p>Check if the number provided is a valid CAS RN.</p>
</dd></dl>

</div>


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