python program that quit only when user wants it to quit

1def main():
2    num1 = int(input("\nEnter the first number: "))
3    num2 = int(input("Enter the second number: "))
4    total = num1 + num2
5    print("The sum of the two number is", total)
6    print("\nDo you want to perform another calculation?")
7    print("Press:\n")
8    print("1. To calculate\n2. To exit")
9    user_choice = int(input("Enter your choice: "))
10    if user_choice == 1:
11        main()
12    elif user_choice == 2:
13        exit()
14    else:
15        print("Your choice was incorrect.")
16
17        
18main()
19
20# This is just an example my fellow Comrades