You can provide a EnvironBuilder or a WSGI environment as only argument instead of the EnvironBuilder ar- guments and two optional keyword arguments (as_tuple, buffered) that change the type of the return sort. However not every application needs a SQL database. The idea of Flask is to build a good foundation for all applications. Everything else is up to you or extensions. 3.2 HTML/XHTML FAQ The Flask

GitHub 上查看本书示例程序的对应 commit：e51c579。 进阶提示 如果你对 CSS 很头疼，可以借助前端框架来完善页面样式，比如 Bootstrap、Semantic-UI、Foundation 等。它们提供了大量的 CSS 定义和动 态效果，使用起来非常简单。 扩展 Bootstrap-Flask 可以简化在 Flask 项目里使用 Bootstrap 4 的步骤。 第 4

sort. However not every application needs a SQL database. The idea of Flask is to build a good foundation for all applications. Everything else is up to you or extensions. HTML/XHTML FAQ The Flask documentation