result = s[::-1]

l = list(s)
l.reverse()
result = "".join(l)

l = list(s)
result = "".join(l[::-1])

result = reduce(lambda x,y:y+x,s)

def func(s):
    if len(s) <1:        
        return s   
    return func(s[1:])+s[0]
result = func(s)