擅长:python、mysql、java
<p>将<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.core.groupby.GroupBy.last.html" rel="nofollow noreferrer">^{<cd1>}</a>与<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.core.groupby.GroupBy.transform.html" rel="nofollow noreferrer">^{<cd2>}</a>一起使用:</p>
<pre><code>#if datetimes are not sorted by an_zeit column
#df9 = df9.sort_values('an_zeit', ascending=False)
df9['ziel'] = df9.groupby(level=0)['an_bf'].transform('last')
#sorting MultiIndex if necessary
#df9 = df9.sort_index()
</code></pre>