input: Write a function to create a Python function to shuffle a list of numbers. The function should return the shuffled list.
  assert shuffle_list([1, 2, 3, 4, 5])==[3, 5, 2, 4, 1]
  assert shuffle_list([5, 4, 3, 2, 1])==[2, 5, 1, 3, 4]
  assert shuffle_list([10, 20, 30])==[20, 30, 10]
  assert shuffle_list([])==[]
  assert shuffle_list([7])==[7]
output: import random
  
  def shuffle_list(lst):
      shuffled = lst[:]
      random.shuffle(shuffled)
      return shuffled