# no.side.effects.py
# This file is not meant to be run
>>> numbers = [4, 1, 7, 5]
>>> sorted(numbers)  # won't sort the original `numbers` list
[1, 4, 5, 7]
>>> numbers  # let's verify
[4, 1, 7, 5]  # good, untouched
>>> numbers.sort()  # this will act on the list
>>> numbers
[1, 4, 5, 7]