擅长:python、mysql、java
<p>(<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.combine_first.html" rel="nofollow">docs</a>)怎么样</p>
<pre><code>>>> df.combine_first(df.T)
a b c d
a 1.0 0.5 0.6 0.5
b 0.5 1.0 0.0 0.4
c 0.6 0.0 1.0 0.3
d 0.5 0.4 0.3 1.0
</code></pre>