. . . . . . 243 12. 一个 I/O 项目：构建命令行程序 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249 12.1. 接受命令行参数 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317 14.5. Cargo 自定义扩展命令 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 对低风险的操作，因为编译器会替你找到经典的错误。同时你可以自信地采取更加激进的优 化，而不会意外引入崩溃或漏洞。 但 Rust 并不局限于底层系统编程。它表达力强、写起来舒适，让人能够轻松地编写出命令行 应用、网络服务器等各种类型的代码——在本书中就有这两者的简单示例。使用 Rust 能让你 把在一个领域中学习的技能延伸到另一个领域：你可以通过编写网页应用来学习 Rust，接着 将同样的技能应用到你的

Tornado is installed in this way, so you may wish to download a copy of the source tarball or clone the git repository as well. Prerequisites: Tornado 6.3 requires Python 3.9 or newer. The following optional get_error_html has been removed; override RequestHandler. write_error instead. Other notes • The git repository has moved to https://github.com/tornadoweb/tornado. All old links should be redirected to

Tornado is installed in this way, so you may wish to download a copy of the source tarball or clone the git repository [https://github.com/tornadoweb/tornado] as well. Prerequisites: Tornado 6.3 requires Python RequestHandler.get_error_html has been removed; override RequestHandler.write_error instead. Other notes The git repository has moved to https://github.com/tornadoweb/tornado. All old links should be redirected to