擅长:python、mysql、java
<p>使用<code>sets</code>变得非常简单</p>
<pre><code>ballots = [['NDP', 'LIBERAL'], ['GREEN', 'NDP'], ['NDP', 'BLOC']]
to_eliminate = ['NDP', 'LIBERAL']
result = [list(set(x) - set(to_eliminate)) for x in ballots]
result
[[], ['GREEN'], ['BLOC']]
</code></pre>
<p>或:</p>
<pre><code>result = [list(set(x).difference(to_eliminate)) for x in ballots]
result
[[], ['GREEN'], ['BLOC']]
</code></pre>