擅长:python、mysql、java
<p>将<a href="http://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Grouper.html" rel="nofollow noreferrer">^{<cd1>}</a>与聚合<code>mean</code>一起使用:</p>
<pre><code>df['buyDate'] = pd.to_datetime(df["buyDate"])
df.groupby([pd.Grouper(freq='M', key='buyDate'),'category', 'subcategory']).mean()
</code></pre>