# Uses a set to count words in Moby-Dick,
# and measures/prints the code's runtime.
import time

def main():
    # count the unique words in the file
    start = time.clock()
    words = set()
    with open("mobydick.txt") as file:
        for word in file.read().lower().split():
            words.add(word)

    end = time.clock()

    # report results
    print("Unique words =", len(words))
    print("Runtime:", round(end - start, 2), "sec")

main()