擅长:python、mysql、java
<p>为什么不创建一个<a href="http://www.sqlalchemy.org/docs/orm/relationships.html#many-to-many" rel="nofollow">table relationships</a>?</p>
<p>实施后,为了获得您想要的:</p>
<pre><code>list_of_rnd_users = [u for u in Users if 'R&D' in u.departments]
</code></pre>
<p>其中.departments属性是关系的属性。</p>