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50  <h1>Source code for sas.data_util.uniquelist</h1><div class="highlight"><pre>
51<span class="c">#</span>
52
53<div class="viewcode-block" id="uniquelist"><a class="viewcode-back" href="../../../dev/api/sas.data_util.html#sas.data_util.uniquelist.uniquelist">[docs]</a><span class="k">def</span> <span class="nf">uniquelist</span><span class="p">(</span><span class="n">inputlist</span><span class="p">,</span> <span class="nb">hash</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span> 
54    <span class="sd">&#39;&#39;&#39;remove redunduant elements from the give list</span>
55<span class="sd">    and return a list of unique elements.</span>
56
57<span class="sd">    inputlist: input list</span>
58<span class="sd">    hash: use this function to make the items in the list hashable.</span>
59
60<span class="sd">    Implementation details:</span>
61<span class="sd">        This function is order-preserving.</span>
62<span class="sd">    &#39;&#39;&#39;</span>
63    <span class="k">if</span> <span class="nb">hash</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
64        <span class="nb">hash</span> <span class="o">=</span> <span class="n">__builtins__</span><span class="o">.</span><span class="n">hash</span>
65    <span class="n">seen</span> <span class="o">=</span> <span class="p">{}</span>
66    <span class="n">result</span> <span class="o">=</span> <span class="p">[]</span>
67    <span class="k">for</span> <span class="n">item</span> <span class="ow">in</span> <span class="n">inputlist</span><span class="p">:</span>
68        <span class="n">marker</span> <span class="o">=</span> <span class="nb">hash</span><span class="p">(</span><span class="n">item</span><span class="p">)</span>
69        <span class="k">if</span> <span class="n">marker</span> <span class="ow">in</span> <span class="n">seen</span><span class="p">:</span> <span class="k">continue</span>
70        <span class="n">seen</span><span class="p">[</span><span class="n">marker</span><span class="p">]</span> <span class="o">=</span> <span class="mi">1</span>
71        <span class="n">result</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">item</span><span class="p">)</span>
72    <span class="k">return</span> <span class="n">result</span>
73
74</div>
75<div class="viewcode-block" id="test"><a class="viewcode-back" href="../../../dev/api/sas.data_util.html#sas.data_util.uniquelist.test">[docs]</a><span class="k">def</span> <span class="nf">test</span><span class="p">():</span>
76    <span class="k">assert</span> <span class="n">uniquelist</span><span class="p">([</span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">])</span><span class="o">==</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">]</span>
77    <span class="k">return</span>
78
79</div>
80<div class="viewcode-block" id="main"><a class="viewcode-back" href="../../../dev/api/sas.data_util.html#sas.data_util.uniquelist.main">[docs]</a><span class="k">def</span> <span class="nf">main</span><span class="p">():</span>
81    <span class="n">test</span><span class="p">()</span>
82    <span class="k">return</span>
83</div>
84<span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">&#39;__main__&#39;</span><span class="p">:</span> <span class="n">main</span><span class="p">()</span>
85
86
87<span class="c"># version</span>
88<span class="n">__id__</span> <span class="o">=</span> <span class="s">&quot;$Id$&quot;</span>
89
90<span class="c"># End of file </span>
91</pre></div>
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