擅长:python、mysql、java
<p><code>pandas</code>重写算术运算符以完全执行您想要的操作。正在将索引加入控件,当前没有。默认情况下,它们执行外部联接:</p>
<pre><code>In [39]: a = DataFrame([[1, 2], [3, 4]], columns=list('CD'), index=list('AB'))
In [40]: b = DataFrame([[1, 2, 5], [1, 3, 4], [6, 7, 8]], columns=list('CDY'), index=list('ABX'))
In [41]: a + b
Out[41]:
C D Y
A 2 4 NaN
B 4 7 NaN
X NaN NaN NaN
</code></pre>
<p>关于这件事<a href="https://github.com/pydata/pandas/issues/1094" rel="nofollow">an open issue on GitHub</a>。在</p>