"""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
import shelve
import sys
from anagram_sets import all_anagrams, signature
def store_anagrams(filename, anagram_map):
"""Stores the anagrams from a dictionary in a shelf.
filename: string file name of shelf
anagram_map: dictionary that maps strings to list of anagrams
"""
shelf = shelve.open(filename, 'c')
for word, word_list in anagram_map.items():
shelf[word] = word_list
shelf.close()
def read_anagrams(filename, word):
"""Looks up a word in a shelf and returns a list of its anagrams.
filename: string file name of shelf
word: word to look up
"""
shelf = shelve.open(filename)
sig = signature(word)
try:
return shelf[sig]
except KeyError:
return []
def main(script, command='make_db'):
if command == 'make_db':
anagram_map = all_anagrams('words.txt')
store_anagrams('anagrams.db', anagram_map)
else:
print(read_anagrams('anagrams.db', command))
if __name__ == '__main__':
main(*sys.argv)
