def __init__(
        self, sim_state: cirq.SimulationStateBase[clifford.StabilizerChFormSimulationState]
    ):
        """Results of a step of the simulator.
        Attributes:
            sim_state: The qubit:SimulationState lookup for this step.
        """
        super().__init__(sim_state)
        self._clifford_state = None
Results of a step of the simulator.
        Attributes:
            sim_state: The qubit:SimulationState lookup for this step.
        
cirq-core/cirq/sim/clifford/clifford_simulator.py