def listKeysAndSizes(self, bucketName):
        """Return a list of (name, size) pairs of keys in the bucket"""
        with self.state_.lock:
            if self.state_.buckets_ not in bucketName:
                raise S3Interface.BucketNotFound(bucketName)

            self.state_.validateAccess(bucketName, self.credentials_)

            return [(key, len(val.value), val.mtime)
                    for key, val in self.state_.buckets_[bucketName].iteritems()]
dataset/ETHPy150Open ufora/ufora/ufora/distributed/S3/InMemoryS3Interface.py/InMemoryS3Interface.listKeysAndSizes/swapped operands of `not in`