input: Write a function to shuffle a given list using the Python random module. If the given list is empty, it should return an empty list.
  
  assert shuffle_list(['a', 'b', 'c']) != ['a', 'b', 'c']
  assert shuffle_list([])==[]
output: import random
  
  def shuffle_list(lst):
      if not lst:
          return []
      shuffled = lst[:]
      random.shuffle(shuffled)
      return shuffled