擅长:python、mysql、java
<p>使用<code>fillna()</code>的解决方案:</p>
<pre><code>>>> import pandas as pd
>>> Sr1 = pd.Series([1, 2, 3, 4], index = ['A', 'B', 'C', 'D'])
>>> Sr2 = pd.Series([5, 6], index = ['A', 'C'])
>>> (Sr1 + Sr2).fillna(Sr1 + 0)
A 6.0
B 2.0
C 9.0
D 4.0
</code></pre>