def __init__(self, id, ret_value, state, traceback=None):
    self.id = id
    self._result = ret_value
    self._state = state
    self._traceback = traceback
def __init__(self, id, ret_value, state, traceback=None):
    self.id = id
    self._result = ret_value
    self._state = state
    self._traceback = traceback