from random import randint

"""
plays a single game of Master Mind, where the
computer picks a number and the human guesses
"""
def play_computer_picks():
    number_of_guesses = 0
    pick = pick_number()

    while True:
        guess = get_guess_from_user()
        number_of_guesses = number_of_guesses + 1
        if pick == guess:
            print "Congratulations!!! You found the answer in", number_of_guesses, "times."
            break

        if pick.lower() == "q":
            print "better luck next time!"
            print "the answer was", pick
            break
        
        feedback = compute_answer(pick, guess)
        print "Feedback:", feedback

"""
returns a random string, containing four digits
between 1 and 6
"""
def pick_number():
    pick = ""

    for i in range(0, 4):
        digit = randint(1, 6)
        pick = pick + str(digit)

    return pick

"""
returns a string entered by the user, containing
four digits between 1 and 6. We also allow a "q"
or "Q". Anything else is rejected and we ask the
user to try again.
"""
def get_guess_from_user():
    while True:
        guess = raw_input("enter your guess: ")
        if (guess.lower() == "q"):
            return guess

        if (is_valid_guess(guess)):
            return guess

        print guess, "is not a valid guess, try again."

"""
returns True if the guess is a four-digit string
containing digits from 1 to 6.
"""
def is_valid_guess(guess):
    for character in guess:
        if not(character in "123456"):
            return False

    return True



print pick_number()