input: 
  def dict_sum(dict):
      """
      Compute the sum of the values of a given dictionary.
      >>> dict_sum({'A': 5, 'B': 6, 'C': 10})
      21
      """
      sum = 0
      for key, value in dict.items():
          sum += value
      return sum
  
output:     sum = 0
      for key, value in dict.items():
          sum += value
      return sum