擅长:python、mysql、java
<p>一种选择是(根据Ritesh Kumar的答案<a href="https://stackoverflow.com/a/15155286/1797098">here</a>)</p>
<pre><code>let = ['a', 'b', 'a', 'c', 'a']
onlySingles = [x for x in let if let.count(x) < 2]
</code></pre>
<p>这给了</p>
<pre><code>>>> onlySingles
['b', 'c']
</code></pre>