from random import randint

def part1():
    car = randint(1,3)
    guess = input('What door would you like to pick: ')
    #print('The car was behind door #' + str(car) + "!")

def part2():
    car = randint(1,3)
    guess = input('What door would you like to pick: ')
    guess = int(guess)

    if car == 1 and guess == 1:
	print('There is a goat behind door 2')
    if car == 2 and guess ==2:
	print('There is a goat behind door 3')
    if car == 3 and guess == 3:
	print('There is a goat behind door 1')

    if (car == guess):
	des = raw_input('Would you like to change your pick? ')
	if (des == 'yes'):
	    guess = (guess+1) % 3

    if guess == car:
	print('You won!')
    else:
	print('The car was behind door #' + str(car) + '!')
	print('You lost!')


def part3():
    rounds = input('How many rounds of the game should be simulated: ')
    while (rounds < 10 or rounds > 10000):
	print('Must enter a number between 10 and 10000')
	rounds = input('Please try again: ')

    action = raw_input('Should the player switch or stay: ')

    while(action != 'switch' and action != 'stay'):
	print('Must enter either switch or stay')
	action = raw_input('Please try again: ')


    won_games = 0;
    for i in range(rounds):
	car = randint(1,3)
	guess = randint(1,3)

	if (car == guess):
	     if (action == 'switch'):
		 guess = (guess+1) % 3

	if guess == car:
            won_games +=1

    percentage = 1.0*(won_games)/rounds #convert to float and get percentage
    percentage =  "{0:.0%}".format(percentage) #format into a percentage
    print('The player won ' + str(won_games) + '/' + str(rounds) + ' games (' + str(percentage) + ')!')




part3()