cli_menu.py

def main_menu():
    while True:
        print("Main Menu:")
        print("1. Option 1")
        print("2. Option 2")
        print("3. Exit")

        choice = input("Enter your choice: ")

        if choice == "1":
            submenu1()
        elif choice == "2":
            submenu2()
        elif choice == "3":
            print("Exiting program.")
            break
        else:
            print("Invalid choice. Please try again.")


def submenu1():
    while True:
        print("Submenu 1:")
        print("1. Sub-option 1")
        print("2. Sub-option 2")
        print("3. Go back to Main Menu")
        print("4. Exit")

        choice = input("Enter your choice: ")

        if choice == "1":
            print("Executing sub-option 1 of Submenu 1.")
        elif choice == "2":
            print("Executing sub-option 2 of Submenu 1.")
        elif choice == "3":
            print("Returning to Main Menu.")
            break
        elif choice == "4":
            print("Exiting program.")
            exit()
        else:
            print("Invalid choice. Please try again.")


def submenu2():
    while True:
        print("Submenu 2:")
        print("1. Sub-option A")
        print("2. Sub-option B")
        print("3. Go back to Main Menu")
        print("4. Submenu 3")

        choice = input("Enter your choice: ")

        if choice == "1":
            print("Executing sub-option A of Submenu 2.")
        elif choice == "2":
            print("Executing sub-option B of Submenu 2.")
        elif choice == "3":
            print("Returning to Main Menu.")
            break
        elif choice == "4":
            submenu3()
        else:
            print("Invalid choice. Please try again.")


def submenu3():
    while True:
        print("Submenu 3:")
        print("1. Sub-option X")
        print("2. Sub-option Y")
        print("3. Go back to Submenu 2")
        print("4. Exit")

        choice = input("Enter your choice: ")

        if choice == "1":
            print("Executing sub-option X of Submenu 3.")
        elif choice == "2":
            print("Executing sub-option Y of Submenu 3.")
        elif choice == "3":
            print("Returning to Submenu 2.")
            break
        elif choice == "4":
            print("Exiting program.")
            exit()
        else:
            print("Invalid choice. Please try again.")


if __name__ == "__main__":
    main_menu()