擅长:python、mysql、java
<h3><code>groupby</code>与<code>as_index=False</code></h3>
<p>不会在新索引中包含分组列</p>
<pre><code>df.groupby(['Year', 'ID'], as_index=False)[['Data1', 'Data2']].sum()
Year ID Data1 Data2
0 1922 B 10 1
1 1923 B 10 1
2 1924 B 10 1
3 2010 A 10 1
4 2011 A 10 1
5 2013 A 20 2
</code></pre>