docs: def as_widget(self, widget=None, attrs=None, only_initial=False):
          """
          Renders the field by rendering the passed widget, adding any HTML
          attributes passed as attrs.  If no widget is specified, then the
          field's default widget will be used.
          """
          if not widget:
              widget = self.field.widget
  
          if self.field.localize:
              widget.is_localized = True
  
          attrs = attrs or {}
          attrs = self.build_widget_attrs(attrs, widget)
          auto_id = self.auto_id
          if auto_id and 'id' not in attrs and 'id' not in widget.attrs:
              if not only_initial:
                  attrs['id'] = auto_id
              else:
                  attrs['id'] = self.html_initial_id
  
          if not only_initial:
              name = self.html_name
          else:
              name = self.html_initial_name
          if isinstance(widget, SmartWidgetMixin) and hasattr(self.form, '_request'):
              return force_text(widget.smart_render(self.form._request, name, self.value(), self.initial,
                                                    self.form, attrs=attrs))
          else:
              return force_text(widget.render(name, self.value(), attrs=attrs))