input: Write a function to generate a new list containing elements from a given list in a single line of Python code. If the given list is empty, return an empty list.
  assert new_list_from([1, 2, 3, 4, 5])==[1, 2, 3, 4, 5]
  assert new_list_from([5, 4, 3, 2, 1])==[5, 4, 3, 2, 1]
  assert new_list_from(["a", "b", "c"])==["a", "b", "c"]
  assert new_list_from([1, "b", 3, "d", 5])==[1, "b", 3, "d", 5]
  assert new_list_from([])==[]
output: def new_list_from(lst):
      return lst[:]