Next, we create another file named silkworm.py. We will begin by creating a module that performs the same customizations we performed through Developer Mode in Chapter 13, Customizing Odoo for Your Business.
Why would we want to put our customization into a module rather than just using Developer Mode?
First off, changes made through Developer Mode are isolated within that instance of Odoo. If you decide you wish to create a new database, you will have to make all the developer changes by hand, again. More importantly, when you make the changes in a module, you have much more control over the final results.