Python 如何获得列表数字的绝对值？

how to obtain absolute value of numbers of a list?

提问by Guangyue He

I have a list of number that looks like the one below.

我有一个数字列表，看起来像下面的那个。

[2,3,-3,-2]

How can I obtain a list of value that contain the absolute value of every value in the above list? In this case it would be

如何获取包含上述列表中每个值的绝对值的值列表？在这种情况下，它将是

[2,3,3,2]

采纳答案by thefourtheye

1. You can use absand mapfunctions like this

   myList = [2,3,-3,-2]
   print map(abs, myList)
   

   Output

   [2, 3, 3, 2]
   

2. Or you can use list comprehension like this

   [abs(number) for number in myList]
   

3. Or you can use list comprehension and a simple if else condition like this

   [-number if number < 0 else number for number in myList]
   

1. 您可以像这样使用abs和map功能

   myList = [2,3,-3,-2]
   print map(abs, myList)
   

   输出

   [2, 3, 3, 2]
   

2. 或者你可以像这样使用列表理解

   [abs(number) for number in myList]
   

3. 或者你可以使用列表理解和一个​​简单的 if else 条件

   [-number if number < 0 else number for number in myList]
   

回答by thefourtheye

A list comprehensionwould also work:

一个列表解析也将工作：

>>> lst = [2,3,-3,-2]
>>> [abs(x) for x in lst]
[2, 3, 3, 2]
>>>

回答by hobbs

[ abs(x) for x in list ]would do it.

[ abs(x) for x in list ]会做的。