擅长:python、mysql、java
<p>在<code>groupby</code>之后只添加一列,并将一些聚合函数传递给<code>groupby</code>,例如<a href="http://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.core.groupby.GroupBy.count.html" rel="nofollow noreferrer">^{<cd3>}</a>:</p>
<pre><code>cols = ['SourceIP', 'SourcePort', 'DestinationIP', 'DestinationPort', 'Protocol']
df['PerSec'] = df.groupby(cols)['SourceIP'].transform('count')
</code></pre>