擅长:python、mysql、java
<p>对<code>groupby</code>对象调用<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.core.groupby.GroupBy.first.html#pandas.core.groupby.GroupBy.first" rel="nofollow">^{<cd1>}</a>,如果要将分组索引作为列返回,则可以选择调用<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.reset_index.html#pandas.DataFrame.reset_index" rel="nofollow">^{<cd3>}</a>:</p>
<pre><code>In [448]:
df.groupby('group').first().reset_index()
Out[448]:
group org count
0 1 org1 2
1 2 org3 1
2 3 org4 3
</code></pre>