doors.py

#!/usr/bin/env python3
from random import randint

counter = {
    'wins': 0,
    'games': 0
}

print('Hello! I wanna play a little game')

while True:
    doors = [None, None, None]
    win_door = randint(0, 2)
    doors[win_door] = 'Prize!!!'
    
    usr_input = int(input("Pick your door"))

    while True:
        open_door = randint(0,2)
        if not doors[open_door] and open_door != usr_input:
            break

    print(f'We opened for you door number {open_door}')
    usr_input = int(input("Choose your door again"))
    if doors[usr_input]:
        print('You won!')
        counter['wins'] += 1
    else:
        print('You Loose!!!')
    counter['games'] += 1
    exit_input = input('Another game?')
    if exit_input == 'exit':
        print("Your rating is {}".format(counter['wins']/counter['games']))
        break