RequestHandler): def get(self): self.write("Hello, world") def make_app(): return tornado.web.Application([ (r"/", MainHandler), ]) async def main(): app = make_app() app.listen(8888) await asyncio.Event() generally causes some work to happen in the background before triggering some future action in the application (as opposed to normal synchronous functions, which do every- thing they are going to do before run(main()) 6.1.5 Structure of a Tornado web application A Tornado web application generally consists of one or more RequestHandler subclasses, an Application object which routes incoming requests to handlers

def get(self): self.write("Hello, world") def make_app(): return tornado.web.Application([ (r"/", MainHandler), ]) async def main(): app = make_app() app.listen(8888) spider Structure of a Tornado web application Templates and UI Authentication and security Running and deploying Web framework tornado.web — RequestHandler and Application classes tornado.template — Flexible background Queue example - a concurrent web spider Structure of a Tornado web application The main coroutine The Application object Subclassing RequestHandler Handling request input Overriding RequestHandler

本地文档 安装程序也自带一份文档的本地拷贝，可以离线阅读。运行 rustup doc 在浏览器中查看本地 文档。 任何时候，如果你拿不准标准库中的类型或函数的用途和用法，请查阅应用程序接口 （application programming interface，API）文档！ 文本编辑器和集成开发环境（Integrated Development Environments, IDE） 本书不会假设你使用何种工具来编写 让我们来看看创建包的时候会发生什么。首先，我们输入命令 cargo new my-project： $ cargo new my-project Created binary (application) `my-project` package $ ls my-project Cargo.toml src $ ls my-project/src main.rs 运行了这条命令后，我们先用 new 新建一个项目，我们称之为 minigrep 以便与可能已经安装在系统上 的 grep 工具相区分。 $ cargo new minigrep Created binary (application) `minigrep` project $ cd minigrep 第一个任务是让 minigrep 能够接受两个命令行参数：文件路径和要搜索的字符串。也就是说 我们希望能够使用 cargo