Promise, Deferred) • Deliver to a queue • Callback registry (e.g. POSIX signals) Regardless of which type of interface is used, asynchronous functions by definition interact differently with their callers; action="/myform" method="POST">' 'type="text" name="message">' 'type="submit" value="Submit">' '') def post(self): self.set_header("Content-Type", "text/plain") self.write("You which maps names (the name of the HTML type="file"> element) to a list of files. Each file is a dictionary of the form {"filename":..., "content_type":..., "body":...}. The files object is only present

Promise, Deferred) Deliver to a queue Callback registry (e.g. POSIX signals) Regardless of which type of interface is used, asynchronous functions by definition interact differently with their callers; 'type="text" name="message">' 'type="submit" value="Submit">' '') def post(self): self.set_header("Content-Type", "text/plain") which maps names (the name of the HTML type="file"> element) to a list of files. Each file is a dictionary of the form {"filename":..., "content_type":..., "body":...}. The files object is only present

cargo new，则这些 git 相关文件则不会生成；可以通过运行 cargo new --vcs=git 来覆盖这些行为。 注意：git 是一个常用的版本控制系统（version control system，VCS）。可以通过 --vcs 参数使 cargo new 切换到其它版本控制系统（VCS），或者不使用 VCS。运行 cargo new --help 查看可用的选项。 请自行选用文本编辑器打开 .expect("Failed to read line"); let guess: u32 = guess.trim().parse().expect("Please type a number!"); println!("You guessed: {guess}"); match guess.cmp(&secret_number) { Ordering::Equal => println!("You win!"), } 这行新代码是： let guess: u32 = guess.trim().parse().expect("Please type a number!"); 这里创建了一个叫做 guess 的变量。不过等等，不是已经有了一个叫做 guess 的变量了吗？确 实如此，不过 Rust 允许用一个新值来 遮蔽 （Shadowing）