擅长:python、mysql、java
<p>您需要<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.groupby.html" rel="nofollow noreferrer">^{<cd1>}</a>+<code>sum</code>+<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.Series.unstack.html" rel="nofollow noreferrer">^{<cd3>}</a>:</p>
^{1}$
<p>或<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.pivot_table.html" rel="nofollow noreferrer">^{<cd4>}</a>:</p>
^{pr2}$