CODEWITHSUNDEEP
pythonlistsortingabsolute-value
Diego Martínez Giardini
Diego Martínez Giardini

Reputation: 1161

Sort a list in python

I have this list

[1,-5,10,6,3,-4,-9]

But now I want the list to be sorted like this:

[10,-9,6,-5,-4,3,1]

As you can see I want to order from high to low no matter what sign each number has, but keeping the sign, is it clear?

Upvotes: 30

Views: 36864

Answers (4)

MD. SHIFULLAH
MD. SHIFULLAH

Reputation: 1731

I'm providing code with output data:

example_list = [3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5]

example_list.sort()
print("Ascending ordered list: ", example_list)

example_list.sort(reverse=True)
print("Descending ordered list: ", example_list)

Output:

Ascending order: [1, 1, 2, 3, 3, 4, 5, 5, 5, 6, 9]
Descending order: [9, 6, 5, 5, 5, 4, 3, 3, 2, 1, 1]

Upvotes: -1

akash patkal
akash patkal

Reputation: 27

sorted([5, 2, 3, 1, 4])

See here for more details.

Upvotes: 1

Lucas Ribeiro
Lucas Ribeiro

Reputation: 6282

Use:

    l.sort(key= abs, reverse = True)

Lists can be sorted using the sort() method. And the sort method has a parameter, called key, which you can pass a function. Using this parameter, your list won't be ordered by the values of the list, but by the values of your function on the list.

In your case, you should use the abs() function, which will return the absolute value of your list elements. So, your list

>>> l = [1,-5,10,6,3,-4,-9]

Will be sorted like it was 

>>>  [abs(1),abs(-5),abs(10),abs(6),abs(3),abs(-4),abs(-9)]

Which should be:

>>> [1 ,-4 ,-5 ,6 ,-9 ,10]

To order from the biggest to the smalles, use the reverse=True parameter also.

Upvotes: 16

Ashwini Chaudhary
Ashwini Chaudhary

Reputation: 250991

Use abs as key to the sorted function or list.sort:

>>> lis = [1,-5,10,6,3,-4,-9]
>>> sorted(lis, key=abs, reverse=True)
[10, -9, 6, -5, -4, 3, 1]

Upvotes: 62

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