numbers = [1, 2, 3, 4, 5]
numbers = [x * 3 for x in numbers]
# numbers is [3, 6, 9, 12, 15]
# map takes a ready-made function: no lambda
labels = list(map(str, numbers))
# labels is ['3', '6', '9', '12', '15']
print(f'{numbers = }')
print(f'{labels = }')