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"""This module contains a code example related to

Think Python, 2nd Edition

by Allen Downey

http://thinkpython2.com

Copyright 2015 Allen Downey

License: http://creativecommons.org/licenses/by/4.0/

"""

from __future__ import print_function, division

def first(word):

"""Returns the first character of a string."""

return word[0]

def last(word):

"""Returns the last of a string."""

return word[-1]

def middle(word):

"""Returns all but the first and last characters of a string."""

return word[1:-1]

def is_palindrome(word):

"""Returns True if word is a palindrome."""

if len(word) <= 1:

return True

if first(word) != last(word):

return False

return is_palindrome(middle(word))

print(is_palindrome('allen'))

print(is_palindrome('bob'))

print(is_palindrome('otto'))

print(is_palindrome('redivider'))