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 Rust 代码。几乎任何文本编辑器都可以搞定！然而，很 多文本编辑器和集成开发环境（IDE）内置了 Rust 支持。你总是可以在 rs 中，为 代码的核心功能编写测试将更加容易。我们可以直接使用多种参数调用函数并检查返回值而无 需从命令行运行二进制文件了。 在这一部分，我们将遵循测试驱动开发（Test Driven Development, TDD）的模式来逐步增 加 minigrep 的搜索逻辑。它遵循如下步骤： 1. 编写一个失败的测试，并运行它以确保它失败的原因是你所期望的。 2. 编写或修改足够的代码来使新的测试通过。 中添加通常是一两句话的描述，因为它将在搜索结果中 和你的 crate 一起显示。对于 license 字段，你需要一个 license 标识符值（license identifier value）。Linux 基金会的 Software Package Data Exchange (SPDX) 列出了可以使用的标识 符。例如，为了指定 crate 使用 MIT License，增加 MIT 标识符： 文件名：Cargo.toml

programming. While some support of WSGI is available in the tornado.wsgi module, it is not a focus of development and most applications should be written to use Tornado’s own interfaces (such as tornado.web) directly between asyncio and Tornado Utilities tornado.autoreload — Automatically detect code changes in development tornado.concurrent — Work with Future objects tornado.log — Logging support tornado.options — Command-line reloading If you pass debug=True to the Application constructor, the app will be run in debug/development mode. In this mode, several features intended for convenience while developing will be enabled

programming. While some support of WSGI is available in the tornado.wsgi module, it is not a focus of development and most applications should be written to use Tornado’s own interfaces (such as tornado.web) directly reloading If you pass debug=True to the Application constructor, the app will be run in debug/development mode. In this mode, several features intended for convenience while developing will be enabled reload itself when anything changes. This reduces the need to manually restart the server during development. However, certain failures (such as syntax errors at import time) can still take the server down