code: def attach_vpn_gateway(self, vpn_gateway_id, vpc_id):
          
          params = {'VpnGatewayId': vpn_gateway_id,
                    'VpcId' : vpc_id}
          return self.get_object('AttachVpnGateway', params, Attachment)
docs: Attaches a VPN gateway to a VPC.
  
          :type vpn_gateway_id: str
          :param vpn_gateway_id: The ID of the vpn_gateway to attach
  
          :type vpc_id: str
          :param vpc_id: The ID of the VPC you want to attach the gateway to.
  
          :rtype: An attachment
          :return: a :class:`boto.vpc.vpngateway.Attachment`