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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

from analyze_book1 import process_file

def subtract(d1, d2):

"""Returns a set of all keys that appear in d1 but not d2.

d1, d2: dictionaries

"""

return set(d1) - set(d2)

def main():

hist = process_file('158-0.txt', skip_header=True)

words = process_file('words.txt', skip_header=False)

diff = subtract(hist, words)

print("The words in the book that aren't in the word list are:")

for word in diff:

print(word, end=' ')

if __name__ == '__main__':

main()