def hamming(string1, string2): "compare two strings and return the hamming number" # How it works: both strings are transformed into tuples of letters # from each string. ("abc","aB") becomes ("a","a") ("b","B"), (c, None)]. # Iterating through the letter pairs and counting the tuples with deviating # letters will yield the hamming number letter_pairs = map(None, string1, string2) hamming_number = sum(letter1 != letter2 for letter1, letter2 in letter_pairs) return hamming_number def main(): print hamming("abc", "aB") if __name__ == "__main__": main()
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