def METHOD_NAME(self, instance_name, bucket=''):
    """
    :param instance_name:
    :param bucket:
    :return:
    """
    if bucket == '':
        bucket = self.bucket
    try:
        data = self.client.get_object(bucket, instance_name)
        return data.read()
    except Exception as e:
        raise Exception("Could not fetch data from bucket, {}".format(e))