• The reverse string in python is not an in-built function.
• By creating the slice operation we can perform the reverse function.
• In this slice operation, we create the slice that starts with the end of the string and moves backward.

                     gfedcba

 right to left indexing:              [-7]    [-6]    [-5]    [-4]      [-3]     [-2]      [-1]

                                                    a          b      c        d          e          f         g 

left to right indexing:             [0]         [1]     [2]     [3]     [4]       [5]        [6]

• In the above example, we are having the string  "abcdefg " which we want to reverse. so create a slice that starts with the end of the string and moves backward.
• here it starts with the end index that is indicated with -1 and moves backward as 5,4,3,2,1,0.
• -1 index  is g
• 5 index is f
• 4 index is e
• 3 index is d
• 2 index is c
• 1 index is b
• 0 index is a
• so the final output is gfedcba.

#write a python code to demonstrate string reverse.