input: Write a function to compute the sum of the values of a given dictionary. If the dictionary is empty, return 0.
  
  def dict_sum(dict):
      sum = 0
      for key, value in dict.items():
          sum += value
      return sum
  
  assert dict_sum({'A': 5, 'B': 6, 'C': 10}) == 21
  assert dict_sum({}) == 0
output: def dict_sum(dict):
      sum = 0
      for key, value in dict.items():
          sum += value
      return sum