code: def get_result(self, bjobid):
          
          result = self._jobs_done[str(bjobid)]
          del self._jobs_done[str(bjobid)]
          return result
docs: Get the result of task. Must only be called ONCE, AFTER the task is done (after a successfull call to is_done).
              :return a tuple (result, grade, problems, tests, custom, archive)
              result is itself a tuple containing the result string and the main feedback (i.e. ('success', 'You succeeded')
              grade is a number between 0 and 100 indicating the grade of the users
              problems is a dict of tuple, in the form {'problemid': result}
              test is a dict of tests made in the container
              custom is a dict containing random things set in the container
              archive is either None or a bytes containing a tgz archive of files from the job