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<h1>
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Natural sort of list
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</h1>
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<ol class="breadcrumb">
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<li>
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<time class="published" datetime="2019-11-04T14:34:00+01:00">
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04 novembre 2019
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</time>
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</li>
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<li>Python</li>
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<li>Other</li>
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</ol>
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<div class='article_content'>
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<p>Natural sort order is an ordering of strings in alphabetical order, except that multi-digit numbers are ordered as a single character. Natural sort order has been promoted as being more human-friendly ("natural") than the machine-oriented pure alphabetical order.</p>
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<p>For example, in alphabetical sorting "z11" would be sorted before "z2" because "1" is sorted as smaller than "2", while in natural sorting "z2" is sorted before "z11" because "2" is sorted as smaller than "11".</p>
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<div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">natural_sort</span><span class="p">(</span><span class="n">l</span><span class="p">):</span>
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<span class="sd">"""</span>
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<span class="sd"> return the list l in a natural sort order</span>
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<span class="sd"> """</span>
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<span class="n">convert</span> <span class="o">=</span> <span class="k">lambda</span> <span class="n">text</span><span class="p">:</span> <span class="nb">int</span><span class="p">(</span><span class="n">text</span><span class="p">)</span> <span class="k">if</span> <span class="n">text</span><span class="o">.</span><span class="n">isdigit</span><span class="p">()</span> <span class="k">else</span> <span class="n">text</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span>
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<span class="n">alphanum_key</span> <span class="o">=</span> <span class="k">lambda</span> <span class="n">key</span><span class="p">:</span> <span class="p">[</span><span class="n">convert</span><span class="p">(</span><span class="n">c</span><span class="p">)</span> <span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">re</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s2">"([0-9]+)"</span><span class="p">,</span> <span class="n">key</span><span class="p">)]</span>
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<span class="k">return</span> <span class="nb">sorted</span><span class="p">(</span><span class="n">l</span><span class="p">,</span> <span class="n">key</span><span class="o">=</span><span class="n">alphanum_key</span><span class="p">)</span>
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</pre></div>
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