擅长:python、mysql、java
<p>使用:</p>
<pre><code>new_df = df.assign(**df.groupby('playerid', sort=False)[['points', 'rebounds']].diff())
print(new_df)
playerid season points rebounds
0 1234 2009-10 NaN NaN
1 1234 2010-11 33.0 27.0
2 2345 2009-10 NaN NaN
3 2345 2010-11 24.0 17.0
</code></pre>