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  2. github.com/tiangolo/fastapi

    docs/zh/docs/tutorial/dependencies/sub-dependencies.md 

    # 子依赖项

FastAPI 支持创建含**子依赖项**的依赖项。

并且，可以按需声明任意**深度**的子依赖项嵌套层级。

**FastAPI** 负责处理解析不同深度的子依赖项。

### 第一层依赖项

下列代码创建了第一层依赖项：

{* ../../docs_src/dependencies/tutorial005.py hl[8:9] *}

这段代码声明了类型为 `str` 的可选查询参数 `q`，然后返回这个查询参数。

这个函数很简单（不过也没什么用），但却有助于让我们专注于了解子依赖项的工作方式。

### 第二层依赖项

接下来，创建另一个依赖项函数，并同时用该依赖项自身再声明一个依赖项（所以这也是一个「依赖项」）：

{* ../../docs_src/dependencies/tutorial005.py hl[13] *}

这里重点说明一下声明的参数：
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  3. github.com/tiangolo/fastapi

    docs_src/async_tests/app_a_py39/main.py 

    from fastapi import FastAPI

app = FastAPI()


@app.get("/")
async def root():
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  4. github.com/tiangolo/fastapi

    docs_src/first_steps/tutorial003_py39.py 

    from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def root():
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  5. github.com/tiangolo/fastapi

    docs_src/behind_a_proxy/tutorial001_01_py39.py 

    from fastapi import FastAPI

app = FastAPI()


@app.get("/items/")
def read_items():
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  6. github.com/tiangolo/fastapi

    docs_src/sql_databases/tutorial002_py39.py 

    from typing import Union

from fastapi import Depends, FastAPI, HTTPException, Query
from sqlmodel import Field, Session, SQLModel, create_engine, select


class HeroBase(SQLModel):
    name: str = Field(index=True)
    age: Union[int, None] = Field(default=None, index=True)


class Hero(HeroBase, table=True):
    id: Union[int, None] = Field(default=None, primary_key=True)
    secret_name: str


class HeroPublic(HeroBase):
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  7. github.com/tiangolo/fastapi

    tests/test_dependency_cache.py 

    from fastapi import Depends, FastAPI, Security
from fastapi.testclient import TestClient

app = FastAPI()

counter_holder = {"counter": 0}


async def dep_counter():
    counter_holder["counter"] += 1
    return counter_holder["counter"]


async def super_dep(count: int = Depends(dep_counter)):
    return count


@app.get("/counter/")
async def get_counter(count: int = Depends(dep_counter)):
    return {"counter": count}
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  8. github.com/tiangolo/fastapi

    docs_src/websockets/tutorial002_an_py39.py 

    from typing import Annotated, Union

from fastapi import (
    Cookie,
    Depends,
    FastAPI,
    Query,
    WebSocket,
    WebSocketException,
    status,
)
from fastapi.responses import HTMLResponse

app = FastAPI()

html = """
<!DOCTYPE html>
<html>
    <head>
        <title>Chat</title>
    </head>
    <body>
        <h1>WebSocket Chat</h1>
        <form action="" onsubmit="sendMessage(event)">
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  9. github.com/tiangolo/fastapi

    docs/zh/docs/tutorial/security/oauth2-jwt.md 

    **高级用户指南**中将介绍如何使用 `scopes`，及如何把 `scopes` 集成至 **FastAPI**。

## 小结

至此，您可以使用 OAuth2 和 JWT 等标准配置安全的 **FastAPI** 应用。

几乎在所有框架中，处理安全问题很快都会变得非常复杂。

有些包为了简化安全流，不得不在数据模型、数据库和功能上做出妥协。而有些过于简化的软件包其实存在了安全隐患。

---

**FastAPI** 不向任何数据库、数据模型或工具做妥协。

开发者可以灵活选择最适合项目的安全机制。

还可以直接使用 `passlib` 和 `PyJWT` 等维护良好、使用广泛的包，这是因为 **FastAPI** 不需要任何复杂机制，就能集成外部的包。

而且，**FastAPI** 还提供了一些工具，在不影响灵活、稳定和安全的前提下，尽可能地简化安全机制。
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  10. github.com/tiangolo/fastapi

    docs/tr/docs/tutorial/path-params.md 

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

/// check | Ek bilgi

Dikkatinizi çekerim ki, fonksiyonunuzun aldığı (ve döndürdüğü) değer olan `3` bir string `"3"` değil aksine bir Python `int`'idir.

Bu tanımlamayla birlikte, **FastAPI** size otomatik istek <abbr title="HTTP isteği ile birlikte gelen string'i Python verisine dönüştürme">"ayrıştırma"</abbr> özelliği sağlar.

///

## Veri Doğrulama
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  11. github.com/tiangolo/fastapi

    docs/uk/docs/tutorial/path-params.md 

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

/// check | Примітка

Зверніть увагу, що значення, яке отримала (і повернула) ваша функція, — це `3`. Це Python `int`, а не рядок `"3"`.

Отже, з таким оголошенням типу  **FastAPI**  автоматично виконує <abbr title="перетворення рядка, що надходить із HTTP-запиту, у типи даних Python">"парсинг"</abbr> запитів.

///

## <abbr title="Або валідація">Перевірка</abbr> даних
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