code: def _find_usage_gateways(self):
          
          # Internet gateways
          gws = self.conn.describe_internet_gateways()
          self.limits['Internet gateways']._add_current_usage(
              len(gws['InternetGateways']),
              aws_type='AWS::EC2::InternetGateway',
          )
docs: find usage for Internet Gateways