This script reads dict word lists and generates word-based passwords.
Not unlike xkcd.
Program also prints how many words have been read, and indicates estimated
password space size in bits.
Using just four words from default English dictionary of ~50k words will
give approximately 90 bits of entropy. Lucky speakers of languages with
rich inflection like Polish (over 3 million words) can easily up this to
over 110 bits of entropy.