@classmethod
    def from_index(cls, index):
        return cls.ALL[index]
Check for a bucket's existence. If it does not exist, 
dataset/ETHPy150Open openstack/nova/nova/objects/fields.py/ResourceClass.from_index--crossover with--dataset/ETHPy150Open wehriam/awspider/awspider/aws/s3.py/AmazonS3.checkAndCreateBucket