def _FindMachineModel(self):
    """Find machine model."""
    for item in self._GetDataTypeItems('hardware'):
      if 'machine_model' is not item:
        self._profile['machine_model'] = item['machine_model']
        return
dataset/ETHPy150Open google/simian/src/simian/mac/common/hw.py/SystemProfile._FindMachineModel/operator `in` -> `is not`