input: Write a function to compute the sum of the values of a given dictionary. The function should take a dictionary as input and return the sum of all its values. If the dictionary is empty, the function should 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({'X':3, 'Y':7, 'Z':12})==22
  assert dict_sum({})==0
output: def dict_sum(dict):
      sum = 0
      for key, value in dict.items():
          sum += value
      return sum