input: Write a function to compute the sum of the values of a given dictionary. The function should iterate through the dictionary items, sum up the values, and return the total sum. 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':1, 'Y':2, 'Z':3})==6
  assert dict_sum({})==0
  assert dict_sum({'P':7})==7
  assert dict_sum({'Q':8, 'R':9})==17
output: def dict_sum(dict):
      sum = 0
      for key, value in dict.items():
          sum += value
      return sum