input: Write a function to shuffle a list of numbers using Python's random module. If the input list is empty, return an empty list.
  assert shuffle_list([1, 2, 3, 4, 5]) != [1, 2, 3, 4, 5]
  assert isinstance(shuffle_list([]), list)
  assert shuffle_list([1]) == [1]
output: import random
  
  def shuffle_list(lst):
      if not lst:
          return []
      shuffled = lst[:]
      random.shuffle(shuffled)
      return shuffled