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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
def signature(s):
    """Returns the signature of this string.
    Signature is a string that contains all of the letters in order.
    s: string
    # TODO: rewrite using sorted()
    t = list(s)
    t.sort()
    t = ''.join(t)
    return t
def all_anagrams(filename):
    """Finds all anagrams in a list of words.
    filename: string filename of the word list
    Returns: a map from each word to a list of its anagrams.
    for line in open(filename):
        word = line.strip().lower()
        t = signature(word)
        # TODO: rewrite using defaultdict
        if t not in d:
            d[t] = [word]
        else:
            d[t].append(word)
    return d
def print_anagram_sets(d):
    """Prints the anagram sets in d.
    d: map from words to list of their anagrams
    for v in d.values():
        if len(v) > 1:
            print(len(v), v)
def print_anagram_sets_in_order(d):
    """Prints the anagram sets in d in decreasing order of size.
    d: map from words to list of their anagrams
    # make a list of (length, word pairs)
    for v in d.values():
        if len(v) > 1:
            t.append((len(v), v))
    # sort in ascending order of length
    t.sort()
    # print the sorted list
    for x in t:
        print(x)
def filter_length(d, n):
    """Select only the words in d that have n letters.
    d: map from word to list of anagrams
    n: integer number of letters
    returns: new map from word to list of anagrams
    res = {}
    for word, anagrams in d.items():
        if len(word) == n:
            res[word] = anagrams
    return res
if __name__ == '__main__':
    anagram_map = all_anagrams('words.txt')
    print_anagram_sets_in_order(anagram_map)
    eight_letters = filter_length(anagram_map, 8)
    print_anagram_sets_in_order(eight_letters)

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