code: def intersection(self, *args):
          '''Returns the intersection of the values whose keys are in *args.  If *args is blank, returns the intersection of all values.
          '''
          values = self.values()
          if args:
              values = [val for key,val in self.items() if key in args]
          return set(reduce(set.intersection, values)f intersection(self, *args):
          '''Returns the intersection of the values whose keys are in *args.  If *args is blank, returns the intersection of all values.
          '''
          values = self.values()
          if args:
              values = [val for key,val in self.items() if key in args]
          return set(reduce(set.intersection, values))
docs: Returns the intersection of the values whose keys are in *args.  If *args is blank, returns the intersection of all values.