text: #!/usr/bin/env python3
  
  """Difference of Max and Min Numbers in List.
  
  Create a function that takes a list and returns the
  difference between the biggest and smallest numbers.
  
  Source:
  https://edabit.com/challenge/XsJLwhAddzbxdQqr4
  """
  
  
  def difference_max_min(lst) -> int:
      """Return the difference between max and min in lst."""
      return max(lst) - min(lst)
  
  
  def main():
      """Run sample difference_max_min functions. Do not import."""
      assert difference_max_min([10, 4, 1, 2, 8, 91]) == 90
      assert difference_max_min([-70, 43, 34, 54, 22]) == 124
      print('Passed.')
  
  
  if __name__ == "__main__":
      main()
  