Есть пара ошибок в python с операторами while и elif

from random import randint

play = "yes"
while play == "yes":
    choice = int(input("Would you like to play yourself(1) or let machine(2) play? press '1' or '2': "))

    if choice == 1:
        print("You chose to play yourself")
        num = randint(1,9999)
        counter = 0
        while True:
            num_guess = int(input("Guess the number: "))
            if num_guess == 0:
                print("Player has left the game")
                break
            else:
                if num_guess > num:
                    print("Your guess is too high")
                elif num_guess < num:
                    print("Your guess is too low")
                elif num_guess == num:
                    print("Yay,you found it")
                    print("It took you " + str(counter) + " tries to guess the number")
                    break
            counter += 1

    elif choice == 2:
        print("You chose to let the machine play")
        your_num = int(input("Enter your number: "))
        lowest = 1
        highest = 9999
        counter = 0
        machine_guess = randint(1,9999)
        if your_num == 0:
            you_sure = input("Are you sure you want to leave the game? yes or no: ")
            if you_sure == "yes":
                print("Player left the game")
                break
        else:   
            while True:
                print("My guess is ",machine_guess) 
                is_it_right = input("Is it too small(<) or too big(>) or machine found(=) the number?: ")
                if is_it_right == ">":
                    if machine_guess > your_num:
                        highest = machine_guess
                        counter += 1
                    else:
                        print("!!!Don't cheat!!!")
                        your_number = input("What was your number?: ")
                        print(str(machine_guess) +" < " + str(your_number) + ",so you should have written '<' instead of what you wrote.Continue ")
                elif is_it_right == "<":
                    if machine_guess < your_num:
                        lowest = machine_guess + 1
                        counter += 1 
                    else:
                        print("!!!Don't Cheat!!!")
                        your_number = input("What was your number?: ")
                        print(str(machine_guess) +" > " + str(your_number) + ",so you should have written '>' instead of what you wrote.Continue ")
                elif is_it_right == " = ": 
                    if machine_guess == your_num:
                        if your_num == machine_guess:
                            counter += 1
                            print("Yayy,I found it")
                            print("It took me " + str(counter) + " tries to guess the number")
                        else:
                            print("You cheated and changed the number during the game.Please play fairly")
                            your_number = input("What was your number?: ")
                            print(str(machine_guess) +" = " + str(your_number) + ",so you should have written '=' instead of what you wrote ")
                        break
                elif is_it_right == 0:
                    you_sure = input("Are you sure you want to leave the game? yes or no: ")
                    if you_sure == "yes":
                        print("Player left the game")
                        break
                machine_guess = (lowest+highest)//2

    elif choice == 0:
        you_sure = input("Are you sure you want to leave the game? yes or no: ")
        if you_sure == "yes":
            print("Player has left the game")
            break

    request = input("Do you want to play again? Answer with 'yes' or 'no': ")
    if request == "no":
        print("You quitted the game")
        break
    elif request == 0:
        you_sure = input("Are you sure you want to leave the game? yes or no: ")
        if you_sure == "yes":
            print("Player left the game")
            break
        

Это мой код для игры "угадай мой номер", здесь самые сложные - это то, что я пытаюсь сделать так, чтобы программа не позволяла пользователю обманывать (это университетская задача, срок выполнения 3 часа) Таким образом, выбор 1 — это когда пользователь решает сыграть в игру «угадай мой номер», а второй выбор — когда компьютер играет в игру. Проблема, с которой я столкнулся:

1. Я не могу заставить код заставить пользователя вводить число в диапазоне (1,9999), а ТОГДА продолжить процесс

2. Как видите, у меня много "if ... == 0" -->. В задаче сказано, что всякий раз, когда (любой из входов) пользователь вводит 0, игра должна останавливаться. Другие работают хорошо, но тот, что в вариант 2 первый если не работает

Если у кого-то есть решение для этого, пожалуйста, помогите, я был бы признателен