code: def validate_bucket(self):
          
          s3_check_cmd = "aws s3 ls s3://{} --profile '{}' --region '{}'".format(self.bucket_name, self.aws_project,
                                                                                 self.aws_regions[0])
          print "Checking for s3 bucket"
          try:
              subprocess.check_output(shlex.split(s3_check_cmd))
          except subprocess.CalledProcessError as e:
              print "Error: {}".format(e)
              print "Unable to query s3 bucket: {}. Validate that it exists, and your user has sufficient permissions"\
                  .format(self.bucket_name)
              sys.exit(5)
docs: Do a quick check to see if the s3 bucket is valid
          :return: