Think Python: How to Think Like a Computer Scientist

                while   i<j:

                                if  word[i] !=  word[j]:

                                                return  False

                                i   =   i+1

                                j   =   j-1

                return  True

Or we could reduce to a previously solved problem and write:

def is_palindrome(word):

                return  is_reverse(word,    word)

Using is_reverse from Figure 8-2.