Scripting Python

Monty Hall Simulation In Python

1 minute read

I created a function in Python that simulates the Monty Hall challenge which the show ‘Let’s Make a Deal’ is based on. There are three doors: one door has a car behind it, while the other two have goats. The player picks one door, then afterwards another door is revealed (which is always a door with a goat). The player has the options of keeping their initial door choice or switiching to the last unopened door to win the car. Switching creates about a 66% or 2/3 of a chance for success, as opposed to staying, as it only has a 33% or 1/3 chance of success.

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import random

def monty_hall(trials): 
    stay_wins = 0
    stay_loss = 0
    switch_wins = 0
    switch_loss = 0
    for x in range(trials):
        doors = ['goat', 'car', 'goat']
        stay_or_switch = ['stay', 'switch']
        door_choice = random.choice(doors)
        stay_or_switch = random.choice(stay_or_switch)
        if stay_or_switch == 'stay':
            if door_choice == 'car':
                stay_wins += 1
            else:
                stay_loss += 1
        elif stay_or_switch == 'switch':
            if door_choice == 'car':
                switch_loss += 1
            if door_choice == 'goat':
                switch_wins += 1

    total_stay_win_perc = int((stay_wins/(stay_wins+stay_loss) * 100))
    total_switch_win_perc = int((switch_wins/(switch_wins+switch_loss) * 100))
    print(f'Amount of Stay wins is {stay_wins}')
    print(f'Amount of Stay losses is {stay_loss}')
    print(f'Amount of Switch wins is {switch_wins}')
    print(f'Amount of Switch losses is {switch_loss}')

    
    print(f'Stay has a win percentage of {total_stay_win_perc}%')
    print(f'Switch has a win percentage of {total_switch_win_perc}%')