def main_menu():
        print("WELCOME TO LIBRARY")
        print("What would you like to do?")
        option=print(input("1. New user \n 2. Existing user ")

        if option == 1:
            new_user()
        elif option == 2:
            old_user()
        else:
            print("please choose a correct value")
            main_menu()

    def new_user():
        print("new user")

    def old_user():
        print("Old user")
    main_menu()

Here is a picture of the error, it says syntax error missing ")" for function call and missing "else" for the first one at "if":

>Solution :

the line

option=print(input("1. New user \n 2. Existing user ")

is missing a closing )
it should be

option=print(input("1. New user \n 2. Existing user "))