cheese = ['Cheddar', 'Stilton', 'Cornish Yarg']
cheese += 'Oke'

print(cheese)
# ['Cheddar', 'Stilton', 'Cornish Yarg', 'O', 'k', 'e']
# 'Oke' needs square brackets to be added to the list as a whole word

cheese = ['Cheddar', 'Stilton', 'Cornish Yarg']
cheese += ['Brie', 'Mozzerella']
print(cheese)