tornado 下劃線括弧是什麼意思？

01-29

在tornado源碼的demo中，blog程序的模板有許多單下劃線+括弧的寫法，請問是什麼意思？比如base.html中的 &{{ _("New post") }}&

給你看一段tornado的源碼希望你能明白。

def get_template_namespace(self): """Returns a dictionary to be used as the default template namespace.


        May be overridden by subclasses to add or modify values.
        The results of this method will be combined with additional

        defaults in the `tornado.template` module and keyword arguments

        to `render` or `render_string`.

        """

        namespace = dict(

            handler=self,

            request=self.request,

            current_user=self.current_user,

            locale=self.locale,

            _=self.locale.translate,

            static_url=self.static_url,

            xsrf_form_html=self.xsrf_form_html,

            reverse_url=self.reverse_url

        )

        namespace.update(self.ui)

        return namespace
    def render_string(self, template_name, **kwargs):

        """Generate the given template with the given arguments.

We return the generated byte string (in utf8). To generate and write a template as a response, use render() above. """ # If no template_path is specified, use the path of the calling file template_path = self.get_template_path() if not template_path: frame = sys._getframe(0) web_file = frame.f_code.co_filename while frame.f_code.co_filename == web_file: frame = frame.f_back template_path = os.path.dirname(frame.f_code.co_filename) with RequestHandler._template_loader_lock: if template_path not in RequestHandler._template_loaders: loader = self.create_template_loader(template_path) RequestHandler._template_loaders[template_path] = loader else: loader = RequestHandler._template_loaders[template_path] t = loader.load(template_name) namespace = self.get_template_namespace() namespace.update(kwargs) return t.generate(**namespace)

注意看

t.generate(**namespace) namespace = dict( handler=self, request=self.request, current_user=self.current_user, locale=self.locale, _=self.locale.translate, static_url=self.static_url, xsrf_form_html=self.xsrf_form_html, reverse_url=self.reverse_url ) _=self.locale.translate

{{ _("New post") }}的意思是把New post這個字元串轉譯成本地語言即國際化。

本地化