When reading the documentation I came across the information that .append takes only 1 argument. (I previously tried to pass in 2 arguments and noticed it returns a very explicit error). In this part of the exercise, I see it shows .append with 2 arguments and double parenthesis.
Is this considered best practice? Why is this working? Also, I read as a suggestion on other website that it would be preferred to use extend. Could that be a better alternative or it is used in other cases?
Thank you a lot!