擅长:python、mysql、java
<p>您可以尝试:</p>
<pre class="lang-py prettyprint-override"><code>from collections import defaultdict
entries = [['1','1a'], [2,'2a'], [3,'3a'], ['1', '1b'], ['2', '2b'], ['3', '3b']]
x = defaultdict(list)
[x[a].append(b) for a,b in entries]
x = dict(x)
</code></pre>
<hr/>
<p><strong>输出</strong></p>
<pre><code>{'1': ['1a', '1b'], 2: ['2a'], 3: ['3a'], '2': ['2b'], '3': ['3b']}
</code></pre>