parse_url_path(url_path: str) → str Converts a static URL path into a filesystem path. url_path is the path component of the URL with static_url_prefix removed. The return value should be filesystem path relative to spaces will be represented as %20 and slashes are left as-is. This is appropriate for the path component of a URL. Note that the default of plus=True is effectively the reverse of Python’s urllib module represented as “%2B”). This is appropriate for query strings and form-encoded values but not for the path component of a URL. Note that this default is the reverse of Python’s urllib module. Added in version 3.1:

供我们调用即可。 在拥有继承的语言中，可以定义一个名为 Component 的类，该类上有一个 draw 方法。其他的 类比如 Button、Image 和 SelectBox 会从 Component 派生并因此继承 draw 方法。它们各自都 可以重写 draw 方法来定义自己的行为，但是框架会把所有这些类型当作是 Component 的实例， 并在其上调用 draw。不过 Rust 并没有继承，我们需要寻找另一种方式来设计 pub fn run(&self) { for component in self.components.iter() { component.draw(); } } } 示例 18-5：在 Screen 上实现一个 run 方法，该方法在每个 component 上调用 draw 方法 这与定义使用了带有 trait bound impl Screen where T: Draw, { pub fn run(&self) { for component in self.components.iter() { component.draw(); } } } 示例 18-6: 一种 Screen 结构体的替代实现，其 run 方法使用泛型和 trait

org/3/library/stdtypes.html#str] Converts a static URL path into a filesystem path. url_path is the path component of the URL with static_url_prefix removed. The return value should be filesystem path relative to spaces will be represented as %20 and slashes are left as-is. This is appropriate for the path component of a URL. Note that the default of plus=True is effectively the reverse of Python’s urllib module represented as “%2B”). This is appropriate for query strings and form-encoded values but not for the path component of a URL. Note that this default is the reverse of Python’s urllib module. Added in version 3.1: