# -*- coding: utf-8 -*-

"""

Created on Thu Feb 2020 20:05

@author: Usman Kotwal

"""

"""

Exercise 11.5. Two words are “rotate pairs” if you can rotate one of them and

get the other (see rotate_word in Exercise 8.5).

Write a program that reads a wordlist and finds all the rotate pairs.

Solution: http: //thinkpython2. com/ code/ rotate_ pairs. py

Part 1: Rotate the word

"""

def word_into_list(word):

#create an empty list and fill it with the elements of the input string

word_list = []

for i in word:

word_list.append(i.lower())

return(word_list)

def letters_into_integers(word):

#turn the elements of the list into integers

word_list_letters = word_into_list(word)

word_list_integers = []

for i in word_list_letters:

word_list_integers.append(ord(i))

return(word_list_integers)

def integers_rotation(word, rotation):

#The letters have been turned to integers and those will be shifted

#by the number __rotation__

word_list_integers_rotated = []

word_list_integers = letters_into_integers(word)

for i in word_list_integers:

if i + rotation < 97:

word_list_integers_rotated.append(i+rotation+26)

#I add 26 to account for the shift due to having 26 letters

#in the alphabet

if i + rotation > 122:

word_list_integers_rotated.append(i+rotation-26)

#I subtract 26 to account for shift when reaching letters past z

else:

word_list_integers_rotated.append(i+rotation)

return(word_list_integers_rotated)

def letters_rotated(word, rotation):

word_list_integers_rotated = integers_rotation(word, rotation)

word_list_letters_rotated = []

for i in word_list_integers_rotated:

word_list_letters_rotated.append(chr(i))

#Turn the integers back to letters

return(word_list_letters_rotated)

def rotated_word(word, rotation):

word_list_letters_rotated = letters_rotated(word, rotation)

word_rotated = ""

for i in word_list_letters_rotated:

word_rotated += i

#Take all the rotated letters and add them back into a string

return word_rotated