擅长:python、mysql、java
<p>尝试使用<a href="https://pandas.pydata.org/pandas-docs/version/0.17.0/generated/pandas.DataFrame.nlargest.html" rel="nofollow noreferrer">^{<cd1>}</a></p>
<pre><code>maxData = all_data.groupby(['Id'])[features].apply(lambda x:x.nlargest(2)[1]).reset_index(drop=True)
</code></pre>