another way by extend slice method. more details
>>> a = "abcde"
>>> a[::-1]
'edcba'
>>>
by string to list --> list reverse --> join list
>>> a
'abcde'
>>> b = list(a)
>>> b
['a', 'b', 'c', 'd', 'e']
>>> b.reverse()
>>> b
['e', 'd', 'c', 'b', 'a']
>>> "".join(b)
'edcba'
>>>