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【Python】从数组中获得一个没有重复元素的数组

作者: / 发布于2011/1/4/ 732

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            <pre style="line-height: 150%; font-family: Verdana, Monospace; font-size: 12px; font-weight: bold; margin-right: 10px"><span style="font-style: italic; color: #808080">###</span>
Author: PeterB
URL: http://www.<span style="color: black">peterbe</span>.<span style="color: black">com</span>/plog/uniqifiers-benchmark
<span style="font-style: italic; color: #808080">###</span>

<span style="color: #0099cc">def</span> f5<span style="color: black">(</span>seq, idfun=<span style="color: #0000ff">None</span><span style="color: black">)</span>:
  <span style="font-style: italic; color: #808080"># order preserving</span>
  <span style="color: #0099cc">if</span> idfun <span style="color: #0099cc">is</span> <span style="color: #0000ff">None</span>:
    <span style="color: #0099cc">def</span> idfun<span style="color: black">(</span>x<span style="color: black">)</span>: <span style="color: #0099cc">return</span> x
  seen = <span style="color: black">{</span><span style="color: black">}</span>
  result = <span style="color: black">[</span><span style="color: black">]</span>
  <span style="color: #0099cc">for</span> item <span style="color: #0099cc">in</span> seq:
    marker = idfun<span style="color: black">(</span>item<span style="color: black">)</span>
    <span style="font-style: italic; color: #808080"># in old Python versions:</span>
    <span style="font-style: italic; color: #808080"># if seen.has_key(marker)</span>
    <span style="font-style: italic; color: #808080"># but in new ones:</span>
    <span style="color: #0099cc">if</span> marker <span style="color: #0099cc">in</span> seen: <span style="color: #0099cc">continue</span>
    seen<span style="color: black">[</span>marker<span style="color: black">]</span> = <span style="color: #ff4500">1</span>
    result.<span style="color: black">append</span><span style="color: black">(</span>item<span style="color: black">)</span>
  <span style="color: #0099cc">return</span> result</pre>
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