def get_current_calibration(self) -> calibration.Calibration | None:
        """Returns metadata about the current calibration for a processor.

        Returns:
            The calibration data or None if there is no current calibration.
        """
Returns metadata about the current calibration for a processor.

        Returns:
            The calibration data or None if there is no current calibration.
        
cirq-google/cirq_google/engine/abstract_processor.py