擅长:python、mysql、java
<p>只需在<code>abs()</code>前添加<code>-</code>ive符号,如下所示:</p>
<pre><code>>>> PosList = [1,2,3,4,5]
>>> NegList = [-1,-2,-3,-4,-5]
# Negative values for `+`ive list
>>> [-abs(item) for item in PosList]
[-1, -2, -3, -4, -5]
# Negative values for `-`ive list
>>> [-abs(item) for item in NegList]
[-1, -2, -3, -4, -5]
</code></pre>