def checkAndCreateBucket(self, bucket):
        d = self.getBucket(bucket)
        d.addErrback(self._checkAndCreateBucketErrback, bucket) 
        return d
Check for a bucket's existence. If it does not exist, 
dataset/ETHPy150Open wehriam/awspider/awspider/aws/s3.py/AmazonS3.checkAndCreateBucket