Hi,

You need to define the instance for your custom module like this:

Here, "custom_module" is the folder name of your module. And here I have just created a widget. And you can call a python method using the call() function as shown in example. Just mention the name of method(eg: "action_test"), which is defined in your model. After method name, the second arguement is used pass some context if any.

For example:

in .py file

class custom_module(models.Model):

_inherit = "product.product"

@api.model

def my_method(self):

      return {"hello": "world"}

in .js file

openerp.custom_module = function(instance, local) {

      var _t = instance.web._t,

      _lt = instance.web._lt;

      var QWeb = instance.web.qweb;

      local.WidgetName = instance.Widget.extend({

              start: function () {

               this.$el.append(QWeb.render("YourTemplateName",{name: "Your name"})); // this is another way of selecting template and pass values in context to that template

                    var self = this;

                    var model = new instance.web.Model("product.product");

                    model.call("my_method", {context: new instance.web.CompoundContext()}).then(function(result) {

                    self.$el.append("<div>Hello " + result["hello"] + "</div>");

                                   });

          }

});

instance.web.client_actions.add('your.object', 'instance.custom_module.WidgetName');