sort numbers in one line

Question

We have numbers in a string like this:

numbers = "1534423543"

We want to sort this and return:

"1,2,3,4,5" 

(only unique numbers!)

How to do it in ONE line?

Answer 1

use set() to get unique items, then sort them using sorted() and finally join them using ",".join()

In [109]: strs="1534423543"

In [110]: ",".join(sorted(set(strs)))
Out[110]: '1,2,3,4,5'

Answer 2

Ashwini has the answer that's on the tip of everyone's fingers - if you're up for an import, you could do...

from itertools import groupby; ','.join(k for k, g in groupby(sorted(nums)))

And that's almost one line :)