아무리 해도 fail가 나옵니다ㅠㅠ

def main():

print("Play Baseball")
yes_or_no= "yes"
while is_yes(yes_or_no) is True:
    user_input = "0"
    random_number = str(get_not_duplicated_three_digit_number())
    print("Random Number is : ", random_number)
    user_input=input("Input guess number : ")
    if user_input is "0":
        break
    while user_input is not "0" :
        if is_validated_number(user_input) is False and user_input != "0":
            print('Wrong Input, Input again')
            user_input= input('Input guess number : ')
        elif user_input == "0":
            break
        else:
            if user_input == random_number:
                print("Strikes : {0} , Balls : {1}".format(get_strikes_or_ball(user_input, random_number)[0],get_strikes_or_ball(user_input, random_number)[1]))
                yes_or_no= input("You win, one more(Y/N) ?")
                if yes_or_no == "0":
                    yes_or_no= "no"
                    break
                while is_yes(yes_or_no)== False and  is_no(yes_or_no)== False:
                    print('Wrong Input, Input again')
                    yes_or_no= input("You win, one more(Y/N) ?")
                user_input= "0"
            else:
                print("Strikes : {0} , Balls : {1}".format(get_strikes_or_ball(user_input, random_number)[0],get_strikes_or_ball(user_input, random_number)[1]))
                user_input=input('Input guess number : ')
                if user_input == "0":
                    yes_or_no= "no"
print("Thank you for using this program")
print("End of the Game")