String slicing and range operators can be used to reverse a string in Python. For example:
>>> 'Hello'[::-1] ‘olleH’ >>>‘Halloween’[::-1] ‘neewollaH’
The  operator can take 3 numbers separated by colon ‘:’. The first is start index, second is end index and third is the stride. Here we have specified the stride as -1 and left other 2 empty, which means we want to go in reverse direction one at a time from beginning to end.
We can also reverse a string using a more readable but slower approach as follows:
>>> ''.join(reversed('Hello')) ‘olleH’ >>> ''.join(reversed('Halloween')) 'neewollaH'
We need to use join as reversed() returns a list and we need to reconstruct string from it.