Simple implementation of the "Hangman" word-guessing game

hangman.py

import random
import string

drawings = (
    r"""
    ------|
    |
    |
    |
    |
    --
    """,
    r"""
    ------|
    |     0
    |
    |
    |
    --
    """,
    r"""
    ------|
    |     0
    |    -+-
    |
    |
    --
    """,
    r"""
    ------|
    |     0
    |   /-+-
    |
    |
    --
    """,
    r"""
    ------|
    |     0
    |   /-+-\
    |
    |
    --
    """,
    r"""
    ------|
    |     0
    |   /-+-\
    |     |
    |
    --
    """,
    r"""
    ------|
    |     0
    |   /-+-\
    |     |
    |    |
    --
    """,
    r"""
    ------|
    |     0
    |   /-+-\
    |     |
    |    | |
    --
    """
)
drawings = iter(drawings)
drawing = next(drawings)

print('Welcome to Hangman.')
print('Good luck!')

words = 'python ruby php java unix linux perl'.split()
target = list(random.choice(words))

known = ['_'] * len(target)
used = []

while known != target:
    print()
    print('-'.join(c if c not in used else ' ' for c in string.ascii_lowercase))
    print(drawing, '\n\t', ' '.join(known))

    guess = input('\nEnter your guess: ').lower()
    while guess in used:
        print("You've already guessed that letter")
        guess = input('Please enter a new guess: ').lower()

    used.append(guess)
    if guess in target:
        print('Yes, {!r} is in the word!'.format(guess))
        for i, letter in enumerate(target):
            if guess == letter:
                known[i] = letter
    else:
        print('Sorry, {!r} is not in the word.'.format(guess))
        try:
            drawing = next(drawings)
        except StopIteration:
            print('\nYou have been hanged!')
            break

else:
    print('\nYou guessed the word correctly!')

print('The word was {!r}'.format(''.join(target)))