擅长:python、mysql、java
<p>对于<code>-1</code>的负值,可以按<a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.sign.html" rel="nofollow noreferrer">^{<cd1>}</a>的值进行多个:</p>
<pre><code>print (df**2 * np.sign(df))
0
0 -100
1 -4
2 4
3 9
4 16
5 25
6 -10000
7 -9
8 16
</code></pre>