from typing import Union

from fastapi import FastAPI, Query
from typing_extensions import Annotated

app = FastAPI()


@app.get("/items/")
async def read_items(
    q: Annotated[
        Union[str, None],
        Query(
            title="Query string",
            description="Query string for the items to search in the database that have a good match",
            min_length=3,
        ),
    ] = None,
):

from typing import Annotated

from fastapi import FastAPI, File, UploadFile

app = FastAPI()


@app.post("/files/")
async def create_file(file: Annotated[bytes | None, File()] = None):
    if not file:
        return {"message": "No file sent"}
    else:
        return {"file_size": len(file)}


@app.post("/uploadfile/")
async def create_upload_file(file: UploadFile | None = None):
    if not file:

from typing import Union

from fastapi import Body, FastAPI
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    description: Union[str, None] = None
    price: float
    tax: Union[float, None] = None


@app.put("/items/{item_id}")
async def update_item(
    item_id: int,
    item: Item = Body(
        examples=[
            {
                "name": "Foo",

```

////

/// info

FastAPI added support for `Annotated` (and started recommending it) in version 0.95.0.

If you have an older version, you would get errors when trying to use `Annotated`.

Make sure you [Upgrade the FastAPI version](../deployment/versions.md#upgrading-the-fastapi-versions){.internal-link target=_blank} to at least 0.95.1 before using `Annotated`.

///

* 📦 `client_secret` (👥 🚫 💪 ⚫️ 👆 🖼).

/// info

`OAuth2PasswordRequestForm` 🚫 🎁 🎓 **FastAPI** `OAuth2PasswordBearer`.

`OAuth2PasswordBearer` ⚒ **FastAPI** 💭 👈 ⚫️ 💂‍♂ ⚖. ⚫️ 🚮 👈 🌌 🗄.

✋️ `OAuth2PasswordRequestForm` 🎓 🔗 👈 👆 💪 ✔️ ✍ 👆, ⚖️ 👆 💪 ✔️ 📣 `Form` 🔢 🔗.

✋️ ⚫️ ⚠ ⚙️ 💼, ⚫️ 🚚 **FastAPI** 🔗, ⚒ ⚫️ ⏩.

///

### ⚙️ 📨 💽

/// tip

## Full Stack FastAPI PostgreSQL

GitHub: <a href="https://github.com/tiangolo/full-stack-fastapi-postgresql" class="external-link" target="_blank">https://github.com/tiangolo/full-stack-fastapi-postgresql</a>

### Full Stack FastAPI PostgreSQL – Funktionen

* Vollständige **Docker**-Integration (Docker-basiert).
* Docker-Schwarmmodus-Deployment.

## 🛠️

🕰 👤 ▶️ 🏗 **FastAPI** ⚫️, 🏆 🍖 ⏪ 🥉, 🔧 🔬, 📄 & 🧰 🔜, & 💡 🔃 🐩 & 🔧 🆑 & 🍋.

## 🔮

👉 ☝, ⚫️ ⏪ 🆑 👈 **FastAPI** ⏮️ 🚮 💭 ➖ ⚠ 📚 👫👫.

⚫️ 💆‍♂ 👐 🤭 ⏮️ 🎛 ♣ 📚 ⚙️ 💼 👍.

📚 👩‍💻 & 🏉 ⏪ 🪀 🔛 **FastAPI** 👫 🏗 (🔌 👤 & 👇 🏉).

✋️, 📤 📚 📈 & ⚒ 👟.

**FastAPI** ✔️ 👑 🔮 ⤴️.

You can also use it directly to create an instance of it and return it from your *path operations*.

You can import it directly from `fastapi`:

```python
from fastapi import Response
```

from typing import List, Union

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    description: Union[str, None] = None
    price: float
    tax: Union[float, None] = None
    tags: List[str] = []


@app.post("/items/")
async def create_item(item: Item) -> Item:
    return item


@app.get("/items/")
async def read_items() -> List[Item]:

Or it might be the case that you just prefer to take other courses because they adapt better to your learning style.

Some course providers ✨ [**sponsor FastAPI**](../help-fastapi.md#sponsor-the-author){.internal-link target=_blank} ✨, this ensures the continued and healthy **development** of FastAPI and its **ecosystem**.