input: Write a function to shuffle a list of numbers using the random module. The function should take a list as input and return the shuffled list. 
  
  assert shuffle_list([1, 2, 3, 4, 5])==[3, 5, 2, 4, 1]
  assert shuffle_list([10, 20, 30, 40, 50])==[40, 10, 50, 20, 30]
  assert shuffle_list([1, 1, 2, 2])==[2, 1, 1, 2]
  assert shuffle_list([1])==[1]
  assert shuffle_list([])==[]
output: import random
  
  def shuffle_list(lst):
      shuffled = lst[:]
      random.shuffle(shuffled)
      return shuffled