':type policy_arn: string
:param policy_arn: The ARN of the policy to attach
:type role_name: string
:param role_name: Role to attach the policy to'

def attach_role_policy(self, policy_arn, role_name):

    params = {'PolicyArn': policy_arn, 'RoleName': role_name}
    return self.get_response('AttachRolePolicy', params)
