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@app.route 装饰器

将 URL 路径绑定到视图函数

@app.route 装饰器 是 CoddyKit 上的免费 Flask Academy 课时。这是第 1 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Flask Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Flask Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

What a Route Is

A route connects a URL path to a Python function. When someone visits that path, Flask runs your function and sends back whatever it returns.

Meet the Decorator

You attach a route using @app.route, a decorator written on the line just above your function. It tells Flask which path this function should handle.

@app.route("/")
def home():
    return "Welcome!"

View Functions

The function below a route is called a view function. Its job is simple: build a response for one specific URL and return it.

The Path Argument

The string you pass, like "/about", is the URL path. It always starts with a slash and tells Flask exactly where this page lives.

@app.route("/about")
def about():
    return "About us"

The Root Path

A single slash, "/", is the root path. It is your home page, the page people see when they open your site with no extra path.

Returning a Response

Whatever your view function returns becomes the page body. A plain string is the simplest response Flask can send to a browser.

@app.route("/hi")
def hi():
    return "Hi there"

Why a Decorator?

The @ symbol means decorator. It registers your function with Flask without you calling anything by hand, so Flask knows about the route at startup.

Function Names Are Yours

The function name does not have to match the URL. Pick clear names like contact or profile, since Flask uses them later to build links.

One Decorator, One Path

Each @app.route binds one path to one function. Want another page? Write another decorator and another function below it.

@app.route("/contact")
def contact():
    return "Email us"

Order Inside the File

You can declare routes in any order in your file. Flask matches by the requested path, not by which function you wrote first.

Paths Are Case Sensitive

Route paths are case sensitive after the host. "/About" and "/about" are different URLs, so keep your paths lowercase and consistent.

Quick Check

Let us make sure the decorator clicked.

Recap

You now wire pages with @app.route: a path string, a view function, and a returned response. That trio is the heart of every Flask app. 🎉

常见问题解答

「@app.route 装饰器」课时是免费的吗？

是的 — 「@app.route 装饰器」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Flask Academy 课程的其余内容，请升级到 CoddyKit PRO。 Flask Academy 课程共包含 4 节课。

「@app.route 装饰器」这节课中我会学到什么？

将 URL 路径绑定到视图函数你通过在浏览器中直接运行的动手代码来练习 Flask Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Flask Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Flask Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 1 节课，共 4 节。

「@app.route 装饰器」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Flask Academy 课中编写并运行代码吗？

能。每节 Flask Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

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