Examples :

  Input:  [2, 3, 1, 4, 5]  Output:  [2 , 0, 1, 3, 4] After sorting list becomes [1, 2, 3, 4, 5] and their index as [2, 0, 1, 3, 4]  Input:  [6 , 4, 7, 8, 1]  Output:  [4, 1, 0, 2, 3] After sorting the list becomes [1, 4, 6, 7, 8] and their index as [ 4, 1, 0, 2, 3]. 

Method 1

import numpy s = numpy.array ([ 2 , 3 , 1 , 4 , 5 ]) sort_index = numpy.argsort (s) print (sort_index)

Output:

 [2, 0, 1, 3, 4] 

Method 2

s = [ 2 , 3 , 1 , 4 , 5 ] li = []   for i in range ( len (s)):   li.append ([s [i], i ]) li.sort () sort_index = []   for x in li: sort_index.append (x [ 1 ])   print (sort_index)

Output:

 [2, 0, 1, 3, 4]