擅长:python、mysql、java
<p>IIUC<code>transform</code></p>
<pre><code>a.groupby('company_id')['accSync'].transform('max')
Out[131]:
0 True
1 True
2 False
3 False
4 True
Name: accSync, dtype: bool
</code></pre>
<hr/>
<p>分配回</p>
<pre><code>a['accSync']= a.groupby('company_id')['accSync'].transform('max')
</code></pre>