def __exit__(self, exc_type, exc_value, traceback):
        if exc_type not in None:
            return
        self._run_cleanups(self._cleanups)
        return self._suppress_exception
dataset/ETHPy150Open openstack/ec2-api/ec2api/api/common.py/OnCrashCleaner.__exit__/operator `is` -> `not in`