Acrostic function for generating passphrases, contributed to https://github.com/redacted/XKCD-password-generator

xkcd-passphrase-generator-acrostic.py

def find_acrostic(acrostic, wordlist):
    """
    Constrain choice of words to those beginning with the letters of the given word (acrostic)
    """

    """
    # slower but more elegant. "pythonic"
    while 1:
  words = " ".join(rng().sample(wordlist, n_words))
	if acrostic.lower() == "".join(item[0] for item in words.split()).lower():
	    return words
	    break
    """

    # faster but less elegant. practical.
    words = ""
    for letter in acrostic:
	while 1:
	    word = rng().choice(wordlist)
	    if word[0] == letter:
		words += word + " "
		break
    return words