"""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'))