code: def run_activity(self):
          
          activity = self.current.activity
          if activity:
              if activity not in self.wf_activities:
                  self._load_activity(activity)
              self.current.log.debug(
                  "Calling Activity %s from %s" % (activity, self.wf_activities[activity]))
              self.wf_activities[self.current.activity](self.current)
docs: runs the method that referenced from current task