擅长:python、mysql、java
<p>只需给出一个数字,就可以隐式地填充该列。</p>
<pre><code>testdf['avg_sales_per_sku'] = testdf.sales.sum() / testdf.skus.sum()
</code></pre>
<p>来自<a href="http://pandas.pydata.org/pandas-docs/stable/dsintro.html#column-selection-addition-deletion">the documentation</a>:</p>
<blockquote>
<p>When inserting a scalar value, it will naturally be propagated to fill
the column</p>
</blockquote>