AttributeError: 'list' object has no attribute 'add'

I tried to use the add() method on a list, but that method belongs to a set, not a list.

reproduce.py

numbers = [1, 2, 3]

numbers.add(4)

AttributeError: 'list' object has no attribute 'add'

numbers = [1, 2, 3]

numbers.append(4)

print(numbers)

I replaced add() with append(), which is the correct method for lists.

Lists and sets support different methods in Python. I need to check the correct method for each data type before using it.