the key argument in sort python code example

Example 1: how to store sorted list into new variable in python

>>> numbers = [6, 9, 3, 1]
>>> numbers_sorted = sorted(numbers)
>>> numbers_sorted
[1, 3, 6, 9]
>>> numbers
[6, 9, 3, 1]

Example 2: python sort multiple keys

records.sort(
  key = lambda l: (l[0], l[2])
)