def process_items(prices: dict[str, float]):
    for item_name, item_price in prices.items():
        print(item_name)

from typing import Optional

from pydantic import BaseModel


class User(BaseModel):
    name: str

from dirty_equals import IsDict
from fastapi import FastAPI
from fastapi.testclient import TestClient
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: Optional[str] = None


class OtherItem(BaseModel):
    price: int


@app.post("/items/")
def save_union_body(item: Union[OtherItem, Item]):
    return {"item": item}


client = TestClient(app)

from typing import Set, Tuple


def process_items(items_t: Tuple[int, int, str], items_s: Set[bytes]):

ℹ 🏬 👆 💪 ⚙️ <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/PUT" class="external-link" target="_blank">🇺🇸🔍 `PUT`</a> 🛠️.

👆 💪 ⚙️ `jsonable_encoder` 🗜 🔢 💽 📊 👈 💪 🏪 🎻 (✅ ⏮️ ☁ 💽). 🖼, 🏭 `datetime` `str`.

//// tab | 🐍 3️⃣.6️⃣ &amp; 🔛

```Python hl_lines="30-35"
{!> ../../docs_src/body_updates/tutorial001.py!}
```

////

//// tab | 🐍 3️⃣.9️⃣ &amp; 🔛

```Python hl_lines="30-35"

  @Override
  public void writeShort(int v) throws IOException {
    out.write(0xFF & v);
    out.write(0xFF & (v >> 8));
  }

  @Override
  public void writeUTF(String str) throws IOException {
    ((DataOutputStream) out).writeUTF(str);
  }

  // Overriding close() because FilterOutputStream's close() method pre-JDK8 has bad behavior:

    public final void writeUTF ( String str ) throws SmbException {
        int len = str.length();
        int ch, size = 0;
        byte[] dst;

        for ( int i = 0; i < len; i++ ) {
            ch = str.charAt(i);
            size += ch > 0x07F ? ( ch > 0x7FF ? 3 : 2 ) : 1;
        }
        dst = new byte[size];
        writeShort(size);
        Encdec.enc_utf8(str, dst, 0, size);
        write(dst, 0, size);

from typing import Union


def say_hi(name: Union[str, None] = None):
    if name is not None:
        print(f"Hey {name}!")
    else:

👈, 👥 ℹ Pydantic 🏷 `TokenData` ⏮️ 🆕 🏠 `scopes`.

⚖ 📊 ⏮️ Pydantic 👥 💪 ⚒ 💭 👈 👥 ✔️, 🖼, ⚫️❔ `list` `str` ⏮️ ↔ & `str` ⏮️ `username`.

↩️, 🖼, `dict`, ⚖️ 🕳 🙆, ⚫️ 💪 💔 🈸 ☝ ⏪, ⚒ ⚫️ 💂‍♂ ⚠.

👥 ✔ 👈 👥 ✔️ 👩‍💻 ⏮️ 👈 🆔, & 🚥 🚫, 👥 🤚 👈 🎏 ⚠ 👥 ✍ ⏭.

```Python hl_lines="46  116-127"

## 💗 💪 = & 🔢

↗️, 👆 💪 📣 🌖 🔢 🔢 🕐❔ 👆 💪, 🌖 🙆 💪 🔢.

, 🔢, ⭐ 💲 🔬 🔢 🔢, 👆 🚫 ✔️ 🎯 🚮 `Query`, 👆 💪:

```Python
q: Union[str, None] = None
```

⚖️ 🐍 3️⃣.1️⃣0️⃣ & 🔛:

```Python
q: str | None = None
```

🖼:

//// tab | 🐍 3️⃣.6️⃣ & 🔛

```Python hl_lines="27"
{!> ../../docs_src/body_multiple_params/tutorial004.py!}
```