input: 
  def find_smallest_number(numbers):
      """Find the smallest number in a list of numbers.
      >>> find_smallest_number([5, 4, 12, 17, 9])
      4
      """
      smallest = numbers[0] 
      for num in numbers:
          if num < smallest:
              smallest = num
      return smallest
  
output:     smallest = numbers[0] 
      for num in numbers:
          if num < smallest:
              smallest = num
      return smallest