cows_and_bulls.py

import random

def compare(inp, num):
    cows = 0
    bulls = 0
    scored_inp = list(inp[:])
    scored_num = list(num[:])

    for i in range(4):
        if inp[i] == scored_num[i]:
            cows = cows + 1
            scored_inp[i] = -1
            scored_num[i] = -2

    for i in range(4):
        try:
            found = scored_num.index(scored_inp[i])
            bulls = bulls + 1
            scored_num[found] = -2
        except(ValueError):
            pass

    return [cows, bulls]

def game():
    num = str(random.randrange(1000, 10000)) 
    print(num)
    count = 0

    while(True):    
        while True:
            try:
                inp = int(input("Podaj czterocyfrowa liczbe (0, zeby zakonczyc): "))

                break
            except(ValueError):
                pass

        if inp == 0:
            break
        elif int(inp) < 1000 or int(inp) > 9999:
            print("Co chcesz zrobic?")
        else:
            result = compare(str(inp), str(num))
            count = count + 1
            print("{} cows, {} bulls".format(result[0], result[1]))
            if result[0] == 4:
                print("Zgadles! Liczba podejsc: {}".format(count))
                break
            

if __name__=="__main__":
    while(True):
        game()
        if input("Nowa gra? ('t') ") != 't':
            break