test for anagagrams in a list of strings

anagrams.py

from collections import defaultdict

def load_words(filename='/usr/share/dict/american-english'):
    with open(filename) as f:
        for word in f:
            yield word.rstrip()

def get_anagrams(source):
    d = defaultdict(list)
    for word in source:
        key = "".join(sorted(word))
        d[key].append(word)
    return d

def print_anagrams(word_source):
    d = get_anagrams(word_source)
    for key, anagrams in d.iteritems():
        if len(anagrams) > 1:
            print(key, anagrams)

# word_source = load_words()
word_source = ["car", "tree", "boy", "girl", "arc", "sarcocarcinomata", "carcinosarcomata"]
print_anagrams(word_source)