擅长:python、mysql、java
<p>你可以用<code>first</code>检查</p>
<pre><code>df=df.groupby(['col1','col2','col3']).first().reset_index()
df
col1 col2 col3 col4 col5 col6
0 A B D 6.0 20.0 44.0
1 A B E 8.0 22.0 46.0
2 A B F 10.0 24.0 48.0
3 A B G NaN NaN 50.0
4 A C D 6.0 20.0 44.0
5 A C E 8.0 22.0 46.0
6 A C F 10.0 24.0 48.0
7 H I D 12.0 26.0 52.0
8 H I J 14.0 28.0 54.0
9 H I K 16.0 30.0 56.0
</code></pre>