擅长:python、mysql、java
<p>替代方案:</p>
<pre><code>In [79]: res = df.groupby(["District","Crop"]).mean()
In [80]: res['Average_Yield'] = res.mean(1)
In [81]: res
Out[81]:
Yield_2006 Yield_2007 Yield_2008 Yield_2009 Average_Yield
District Crop
AHMEDNAGAR PADDY 809.212500 1214.1 983.45 398.1125 851.218750
AMRAVATI PADDY 539.828571 799.9 370.90 272.8000 495.857143
</code></pre>