old_contents: # -*- coding: utf-8 -*-
  # Copyright 2016 Onestein (<http://www.onestein.eu>)
  # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
  
  from odoo import api, models
  
  
  class SaleOrderConfirmWizard(models.TransientModel):
      _name = "sale.order.confirm.wizard"
      _description = "Wizard - Sale Order Confirm"
  
      @api.multi
      def confirm_sale_orders(self):
          self.ensure_one()
          active_ids = self._context.get('active_ids')
          orders = self.env['sale.order'].browse(active_ids)
          orders.action_confirm()
  
new_contents: # -*- coding: utf-8 -*-
  # Copyright 2016 Onestein (<http://www.onestein.eu>)
  # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
  
  from odoo import models, api
  
  
  class SaleOrderConfirmWizard(models.TransientModel):
      _name = "sale.order.confirm.wizard"
      _description = "Wizard - Sale Order Confirm"
  
      @api.multi
      def confirm_sale_orders(self):
          self.ensure_one()
          active_ids = self._context.get('active_ids')
          orders = self.env['sale.order'].browse(active_ids)
          for order in orders:
              if order.state in ['draft', 'sent']:
                  order.action_confirm()
  
subject: Make sure only Sales Order with state in 'draft' or 'sent' is confirmed (state 'canceled' will not be confirmed)