# পাইথন এর <abbr title="একটি ভেরিয়েবল কি ধরনের ডেটা ধারণ করতে পারে।">টাইপ্স</abbr> পরিচিতি

Python-এ ঐচ্ছিক "টাইপ হিন্ট" (যা "টাইপ অ্যানোটেশন" নামেও পরিচিত) এর জন্য সাপোর্ট রয়েছে।

এই **"টাইপ হিন্ট"** বা অ্যানোটেশনগুলি এক ধরণের বিশেষ <abbr title="সিনট্যাক্স হল প্রোগ্রামিং ভাষায় কোড লেখার নিয়ম ও গঠন।">সিনট্যাক্স</abbr> যা একটি ভেরিয়েবলের <abbr title="যেমন: str, int, float, bool">টাইপ</abbr> ঘোষণা করতে দেয়।

Here's where it becomes important to be able to declare <abbr title="greater than"><code>gt</code></abbr> and not just <abbr title="greater than or equal"><code>ge</code></abbr>. As with it you can require, for example, that a value must be greater than `0`, even if it is less than `1`.

So, `0.5` would be a valid value. But `0.0` or `0` would not.

And the same for <abbr title="less than"><code>lt</code></abbr>.

//// tab | Python 3.9+

///

## 데이터 <abbr title="다음으로도 알려져 있습니다: 직렬화, 파싱, 마샬링">변환</abbr>

이 예제를 실행하고 <a href="http://127.0.0.1:8000/items/3" class="external-link" target="_blank">http://127.0.0.1:8000/items/3</a>을 열면, 다음 응답을 볼 수 있습니다:

```JSON
{"item_id":3}
```

/// check | "확인"

함수가 받은(반환도 하는) 값은 문자열 `"3"`이 아니라 파이썬 `int` 형인 `3`입니다.

즉, 타입 선언을 하면 **FastAPI**는 자동으로 요청을 <abbr title="HTTP 요청에서 전달되는 문자열을 파이썬 데이터로 변환">"파싱"</abbr>합니다.

**FastAPI** 🤝 👆 📄:

### ⚓️ 🔛 📂 🐩

* <a href="https://github.com/OAI/OpenAPI-Specification" class="external-link" target="_blank"><strong>🗄</strong></a> 🛠️ 🏗, ✅ 📄 <abbr title="also known as: endpoints, routes">➡</abbr> <abbr title="also known as HTTP methods, as POST, GET, PUT, DELETE">🛠️</abbr>, 🔢, 💪 📨, 💂‍♂, ♒️.
* 🏧 📊 🏷 🧾 ⏮️ <a href="https://json-schema.org/" class="external-link" target="_blank"><strong>🎻 🔗</strong></a> (🗄 ⚫️ 🧢 🔛 🎻 🔗).

* <abbr title="також відомий як: serialization, parsing, marshalling">Перетворення</abbr> вхідних даних: з мережі до даних і типів Python. Читання з:
    * JSON.
    * Параметрів шляху.
    * Параметрів запиту.
    * Cookies.
    * Headers.
    * Forms.
    * Файлів.

* <a href="https://github.com/OAI/OpenAPI-Specification" class="external-link" target="_blank"><strong>OpenAPI</strong></a> voor het maken van API's, inclusief declaraties van <abbr title="ook bekend als: endpoints, routess">pad</abbr><abbr title="ook bekend als HTTP-methoden, zoals POST, GET, PUT, DELETE">bewerkingen</abbr>, parameters, request bodies, beveiliging, enz.

In this case, `item_id` is declared to be an `int`.

/// check

This will give you editor support inside of your function, with error checks, completion, etc.

///

## Data <abbr title="also known as: serialization, parsing, marshalling">conversion</abbr>

If you run this example and open your browser at <a href="http://127.0.0.1:8000/items/3" class="external-link" target="_blank">http://127.0.0.1:8000/items/3</a>, you will see a response of:

/// check | Revisa

Esto te dará soporte en el editor dentro de tu función, con chequeo de errores, auto-completado, etc.

///

## <abbr title="también conocido en inglés como: serialization, parsing, marshalling">Conversión</abbr> de datos

  // devices.
  virtual absl::Status Dim(int dim_index, int64_t* dim) const = 0;

  // Returns the device which created the handle.
  virtual const char* DeviceName(absl::Status* status) const = 0;
  // Returns the device where the tensor was placed.
  virtual const char* BackingDeviceName(absl::Status* status) const = 0;
  // Returns the device type which created the handle.

```

## 숫자 검증: 부동소수, 크거나 및 작거나

숫자 검증은 `float` 값에도 동작합니다.

여기에서 <abbr title="greater than or equal"><code>ge</code></abbr>뿐만 아니라 <abbr title="greater than"><code>gt</code></abbr>를 선언 할 수있는 것이 중요해집니다. 예를 들어 필요한 경우, 값이 `1`보다 작더라도 반드시 `0`보다 커야합니다.

즉, `0.5`는 유효한 값입니다. 그러나 `0.0` 또는 `0`은 그렇지 않습니다.

<abbr title="less than"><code>lt</code></abbr> 역시 마찬가지입니다.

```Python hl_lines="11"