def get_bucket_region(self, bucket) -> str:
        """
        Get region associated with a specified bucket name.
        :param bucket: the bucket to be checked.
        :return: region, Note that underlying AWS API returns None for default US-East-1,
        I'm replacing that with us-east-1.
        """
        region = self.s3_client.get_bucket_location(Bucket=bucket)["LocationConstraint"]
        return 'us-east-1' if region is None else region
Get region associated with a specified bucket name.
        :param bucket: the bucket to be checked.
        :return: region, Note that underlying AWS API returns None for default US-East-1,
        I'm replacing that with us-east-1.