擅长:python、mysql、java
<p>您可以在<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.groupby.html" rel="nofollow noreferrer">^{<cd2>}</a>中包含<code>items</code>列,然后使用<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.core.groupby.GroupBy.size.html" rel="nofollow noreferrer">^{<cd3>}</a>。在</p>
<pre><code>>>> df.groupby(['franchise', 'items']).size().unstack(fill_value=0)
items bird cat dog fish
franchise
franchise_A 0 1 3 0
franchise_B 1 0 0 1
</code></pre>
<hr/>
<p><strong>(<em>粗略</em>)基准</strong></p>
^{pr2}$