code: def get_widget_template(self, field_name, field):
          
          templates = self.widget_template_overrides or {}
  
          template_name = templates.get(field_name, None)
          if template_name:
              return template_name
  
          template_name = templates.get(field.widget.__class__, None)
          if template_name:
              return template_name
  
          return None
docs: Returns the optional widget template to use when rendering the widget
          for a form field.
  
          Preference of template selection:
              1. Template from `widget_template_overrides` selected by field name
              2. Template from `widget_template_overrides` selected by widget class
  
          By default, returns `None` which means "use Django's default widget template".
  
          :param field_name: The field name to select a widget template for.
          :param field: `Field` instance to return a widget template.
          :return: Template name to use when rendering the widget or `None`