def createBucket(self, bucketName, credentials):
        assert self.bucketOwners_ not in bucketName
        self.bucketOwners_[bucketName] = credentials
        self.buckets_[bucketName] = {}
dataset/ETHPy150Open ufora/ufora/ufora/distributed/S3/InMemoryS3Interface.py/InMemoryS3State.createBucket/swapped operands of `not in`