input: Write a function to generate a list of squared values from a given list using list comprehension.
  
  def squared_list(input_list):
      return [x*x for x in input_list]
  
  assert squared_list([1, 2, 3, 5, 8, 13]) == [1, 4, 9, 25, 64, 169]
output: def squared_list(input_list):
      return [x*x for x in input_list]