code: def as_widget(self, widget=None, attrs=None, only_initial=False):
          
          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))
docs: 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.