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使用 requirements.txt 固定依赖版本

锁定确切版本，让安装结果保持一致

使用 requirements.txt 固定依赖版本 是 CoddyKit 上的免费 MLOps 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 MLOps Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 MLOps 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。

Why Pin Anything?

Your code calls libraries, and libraries change. Pinning means writing down the exact versions so today's install matches tomorrow's. 📌

The File That Lists Them

In Python, a plain text file named requirements.txt lists every package your project needs, one per line. It is your install recipe.

scikit-learn
pandas
numpy

Loose Versions Bite Back

A bare name like pandas installs the newest release, which can differ tomorrow. That silent change is how a working model suddenly breaks.

Pin the Exact Version

Use the == operator to lock a precise version. Now every machine installs the same code, every single time.

scikit-learn==1.4.2
pandas==2.2.1
numpy==1.26.4

Freeze What You Have

The pip freeze command prints every installed package with its exact version, ready to paste into your file.

pip freeze > requirements.txt

Install From the File

Hand the file to pip and it recreates your whole setup. The -r flag means read requirements from this file.

pip install -r requirements.txt

Compatible-Release Ranges

The ~= operator allows safe patch updates but blocks breaking ones. It accepts 1.4.x but never jumps to 1.5.

scikit-learn~=1.4.0

Transitive Dependencies

The packages you list pull in their own dependencies too. Those hidden ones can shift versions and break you just as easily.

Lock the Whole Tree

A lock file records the exact version of every package, including hidden transitive ones. pip-tools and Poetry generate these for you.

pip-compile requirements.in

Verify With Hashes

Adding a hash makes pip reject any package whose bytes do not match. It guards against tampered or swapped downloads.

numpy==1.26.4 --hash=sha256:abc123...

Commit It to Git

Check requirements.txt into version control beside your code. Now the exact environment travels with every commit and review.

Quick Check

Which line guarantees the same scikit-learn version on every machine?

Recap

You learned to pin exact versions in requirements.txt, freeze and reinstall them, and lock the full tree so installs stay deterministic. 🎯

常见问题解答

「使用 requirements.txt 固定依赖版本」课时是免费的吗？

是的 — 「使用 requirements.txt 固定依赖版本」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 MLOps Academy 课程的其余内容，请升级到 CoddyKit PRO。 MLOps Academy 课程共包含 4 节课。

「使用 requirements.txt 固定依赖版本」这节课中我会学到什么？

锁定确切版本，让安装结果保持一致你通过在浏览器中直接运行的动手代码来练习 MLOps 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 MLOps Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 MLOps 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。

「使用 requirements.txt 固定依赖版本」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 MLOps Academy 课中编写并运行代码吗？

能。每节 MLOps 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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