code: def result(self):
          '''
          :return: None if the result is not ready, the result from set_result, or raise the exception
                   from set_exception. If the result can be None, it is not possible to tell if the result is
                   available; use done() to determine that.
          '''
          try:
              r = getattr(self, '_result')
          except AttributeError:
              return None
          else:
              if hasattr(self, '_exception'):
                  raise self._exception
              else:
                  return f result(self):
          '''
          :return: None if the result is not ready, the result from set_result, or raise the exception
                   from set_exception. If the result can be None, it is not possible to tell if the result is
                   available; use done() to determine that.
          '''
          try:
              r = getattr(self, '_result')
          except AttributeError:
              return None
          else:
              if hasattr(self, '_exception'):
                  raise self._exception
              else:
                  return r
docs: :return: None if the result is not ready, the result from set_result, or raise the exception
                   from set_exception. If the result can be None, it is not possible to tell if the result is
                   available; use done() to determine that.