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Struct 与 Python 类的比较

了解 struct 为何静态且快速

Struct 与 Python 类的比较 是 CoddyKit 上的免费 Mojo Academy 课时。 这是第 4 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 Mojo Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Mojo 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。

They Look Similar

A Mojo struct and a Python class both bundle data with methods, so they feel familiar. But under the hood they are quite different. 🔍

Structs Are Static

A struct's layout is fixed at compile time. The compiler knows every field and type ahead, so it generates tight, fast code.

Classes Are Dynamic

Python classes are dynamic: you can add attributes at runtime. That flexibility is convenient but costs lookups and speed.

No Surprise Attributes

In a struct you cannot tack on a new field after definition. Mojo rejects it, which catches typos and keeps the layout honest.

Value vs Reference

Structs are value types, so assigning copies them. Python objects are references, so two names can point to the same object.

Predictable Copies

Because structs copy on assignment, changing one instance never silently mutates another. That removes a whole class of aliasing bugs.

Speed Is the Payoff

Static layout and value semantics let Mojo skip runtime overhead. The result is performance close to C for your custom types.

No Inheritance, Yet

Structs do not use class-style inheritance. Instead Mojo shares behavior through traits, which you will explore later in the path.

Typed Fields Required

Every struct field needs a declared type, while Python attributes are untyped by default. Types are what let Mojo optimize so aggressively.

var x: Int

When to Use Each

Reach for a struct when you want speed and a fixed shape. Keep Python classes when you need runtime flexibility from existing libraries.

Same Syntax, Different Engine

The takeaway: structs borrow Python's friendly syntax but run on a static, compiled engine. You write familiar code that goes fast.

struct Point:
    var x: Int
    var y: Int

Quick Check

Let us compare structs and Python classes.

Recap

Structs trade Python's runtime flexibility for a static, value-based design that runs fast. You now know when each one shines. 🎯

常见问题解答

「Struct 与 Python 类的比较」课时是免费的吗？

是的 — 「Struct 与 Python 类的比较」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 Mojo Academy 课程的其余内容，请升级到 CoddyKit PRO。 Mojo Academy 课程共包含 4 节课。

「Struct 与 Python 类的比较」这节课中我会学到什么？

了解 struct 为何静态且快速 你通过在浏览器中直接运行的动手代码来练习 Mojo 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 Mojo Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Mojo 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 4 节课，共 4 节。

「Struct 与 Python 类的比较」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 Mojo Academy 课中编写并运行代码吗？

能。每节 Mojo 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。

此课程中的所有课时

  1. 定义 struct
  2. 字段与 __init__ 方法
  3. 向 struct 添加方法
  4. Struct 与 Python 类的比较
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