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render_template 与 templates 文件夹

返回 HTML 文件，而不是字符串

render_template 与 templates 文件夹 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。

From Strings to Pages

So far your routes returned plain strings. Real pages need HTML, and Flask gives you render_template to serve full HTML files cleanly.

What render_template Does

render_template finds an HTML file, runs it through the template engine, and returns the finished page as your response body.

from flask import render_template

@app.route('/')
def home():
    return render_template('index.html')

The templates Folder

Flask looks for your HTML in a folder named templates next to your app file. Put index.html there and Flask finds it automatically. 📁

myapp/
  app.py
  templates/
    index.html

Why a Fixed Name

The name templates is a convention, not a guess. Flask knows where to look, so you never write the folder path inside render_template.

Reference Only the Filename

You pass just the filename, not a full path. Flask joins it onto the templates folder for you, keeping your code short and portable.

return render_template('about.html')

Subfolders Inside templates

You can group pages in subfolders and reference them with forward slashes. This keeps a large project tidy as it grows.

return render_template('users/profile.html')

A Minimal Template

A template is ordinary HTML at heart. The simplest one is just a regular page with no special syntax yet.

<!doctype html>
<title>Home</title>
<h1>Welcome</h1>

Templates Get Rendered

Even a plain file is rendered: Flask processes it through Jinja2 first. That step is what lets you add dynamic pieces later.

Returning the Result

render_template returns a string of HTML, which you return from your view. Flask wraps it in a proper response with the right content type.

@app.route('/')
def home():
    return render_template('index.html')

TemplateNotFound Errors

If Flask cannot find the file, you get a TemplateNotFound error. Check the spelling and that the file truly sits inside templates.

Separating Logic and Markup

Templates keep HTML out of your Python. Views handle logic, templates handle presentation, and that split keeps both far easier to read.

Quick Check

Where does Flask expect your HTML files to live by default?

Recap

You learned that render_template serves HTML from the templates folder by filename, so logic stays in Python and markup stays in files. Nice work! 🎉

常见问题解答

「render_template 与 templates 文件夹」课时是免费的吗？

是的 — 「render_template 与 templates 文件夹」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。

「render_template 与 templates 文件夹」这节课中我会学到什么？

返回 HTML 文件，而不是字符串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。

「render_template 与 templates 文件夹」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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