Just like we can create custom fields and validators, we can also create custom widgets. These widgets allow us to control how our fields will look at the frontend. Each field type has a widget associated with it. WTForms, by itself, provides a lot of basic and HTML5 widgets. In this recipe, to understand how to write a custom widget, we will convert our custom selection field for Category into a radio field. I agree with those of you who would argue that we can directly use the radio field provided by WTForms. Here, we are just trying to understand how to do it ourselves.
The widgets provided by default by WTForms can be found at https://wtforms.readthedocs.org/en/latest/widgets.html.
