{* ../../docs_src/dependencies/tutorial001_02_an_py310.py hl[12,16,21] *}

/// tip | İpucu

Bu aslında standart Python'dır; buna "type alias" denir ve **FastAPI**'ye özel bir şey değildir.

Ama **FastAPI**, `Annotated` dahil Python standartları üzerine kurulu olduğu için bu tekniği kodunuzda kullanabilirsiniz. 😎

///

# Возможности { #features }

## Возможности FastAPI { #fastapi-features }

**FastAPI** предлагает вам следующее:

### Основано на открытых стандартах { #based-on-open-standards }

### Write your own async code { #write-your-own-async-code }

Starlette (and **FastAPI**) are based on [AnyIO](https://anyio.readthedocs.io/en/stable/), which makes it compatible with both Python's standard library [asyncio](https://docs.python.org/3/library/asyncio-task.html) and [Trio](https://trio.readthedocs.io/en/stable/).

<img src="/img/tutorial/path-params/image01.png">

/// check | 확인

다시 한 번, 동일한 파이썬 타입 선언만으로 **FastAPI**는 자동 대화형 문서(Swagger UI 통합)를 제공합니다.

경로 매개변수가 정수형으로 선언된 것을 확인할 수 있습니다.

///

## 표준 기반의 이점, 대체 문서 { #standards-based-benefits-alternative-documentation }

그리고 생성된 스키마는 [OpenAPI](https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.1.0.md) 표준에서 나온 것이기 때문에 호환되는 도구가 많이 있습니다.

That way, it behaves almost as if it was just a global variable. But as it uses a dependency function, then we can override it easily for testing.

`@lru_cache` is part of `functools` which is part of Python's standard library, you can read more about it in the [Python docs for `@lru_cache`](https://docs.python.org/3/library/functools.html#functools.lru_cache).

## Recap { #recap }

		if f == "" || len(f)%2 != 0 || strings.TrimLeft(f, "0123456789abcdef") != "" {
			return false
		}
	}
	return true
}

// It would be nice if the error messages always began with
// the standard file:line: prefix,
// but that's not where we are today.
// It might be at the beginning but it might be in the middle of the printed instruction.

	directoryHeaderSignature = 0x02014b50
	directoryEndSignature    = 0x06054b50
	directory64LocSignature  = 0x07064b50
	directory64EndSignature  = 0x06064b50
	dataDescriptorSignature  = 0x08074b50 // de-facto standard; required by OS X Finder
	fileHeaderLen            = 30         // + filename + extra
	directoryHeaderLen       = 46         // + filename + extra + comment
	directoryEndLen          = 22         // + comment

Зверніть увагу, що параметр шляху оголошено як ціле число.

///

## Переваги стандартів, альтернативна документація { #standards-based-benefits-alternative-documentation }

І оскільки згенерована схема відповідає стандарту [OpenAPI](https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.1.0.md), існує багато сумісних інструментів.

                    .get());
            options.addOption(Option.builder()
                    .longOpt(RAW_STREAMS)
                    .desc("Do not decorate standard output and error streams")
                    .get());
            options.addOption(Option.builder(SHOW_VERSION)
                    .longOpt("show-version")

///

For example, this custom validator checks that the item ID starts with `isbn-` for an <abbr title="International Standard Book Number">ISBN</abbr> book number or with `imdb-` for an <abbr title="Internet Movie Database: a website with information about movies">IMDB</abbr> movie URL ID: