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"""This module contains code from

Think Python by Allen B. Downey

http://thinkpython.com

Copyright 2012 Allen B. Downey

License: GNU GPLv3 http://www.gnu.org/licenses/gpl.html

"""

import string

def rotate_letter(letter, n):

"""Rotates a letter by n places. Does not change other chars.

letter: single-letter string

n: int

Returns: single-letter string

"""

if letter.isupper():

start = ord('A')

elif letter.islower():

start = ord('a')

else:

return letter

c = ord(letter) - start

i = (c + n) % 26 + start

return chr(i)

def rotate_word(word, n):

"""Rotates a word by n places.

word: string

n: integer

Returns: string

"""

res = ''

for letter in word:

res += rotate_letter(letter, n)

return res

if __name__ == '__main__':

print rotate_word('cheer', 7)

print rotate_word('melon', -10)

print rotate_word('sleep', 9)