Produce candidates for solution of a Caesar cipher using a dictionary

caesar-cipher-solve.py

from os.path import expanduser


def match_word(pattern, wordfile=None):
    wordfile = wordfile or os.path.expanduser("~/Downloads/sowpods.txt")
    with open(wordfile) as handle:
        for line in handle:
            word = line.rstrip().lower()
            lookup = {c: d for c, d in zip(pattern, word)}
            if "".join(lookup.get(c, '!') for c in pattern) == word:
                yield word

pattern = "PIKODENHFENJIKM"
for word in match_word(pattern):
    print(word)