<img src="/img/tutorial/generate-clients/image02.png">

👆 🔜 🤚 ✍ 🚀 📨:

<img src="/img/tutorial/generate-clients/image03.png">

/// tip

👀 ✍ `name` &amp; `price`, 👈 🔬 FastAPI 🈸, `Item` 🏷.

///

👆 🔜 ✔️ ⏸ ❌ 📊 👈 👆 📨:

<img src="/img/tutorial/generate-clients/image04.png">

📨 🎚 🔜 ✔️ ✍:

<img src="/img/tutorial/generate-clients/image05.png">

```Python hl_lines="4  9-12  25-27"
from typing import Union

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


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


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):

```Python hl_lines="4  9-12  25-27"
from typing import Union

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


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


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):

 * factory classes like:
 *
 * <pre>
 * interface Book {...}
 * public class Books {
 *   public static Book hardcover(String title) {...}
 *   public static Book paperback(String title) {...}
 * }
 * </pre>
 *
 * <p>And all the created {@code Book} instances can be tested with:
 *
 * <pre>
 * new ClassSanityTester()
 *     .forAllPublicStaticMethods(Books.class)

```Python hl_lines="4  9-12  25-27"
from typing import Union

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


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


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):

    "description": "The bartenders",
    "price": 62,
    "tax": 20.2
}
```

serán incluidos en el response.

#### Datos con los mismos valores que los valores por defecto

Si los datos tienen los mismos valores que los valores por defecto, como el artículo con ID `baz`:

```Python hl_lines="3  5-6"
{
    "name": "Baz",
    "description": None,
    "price": 50.2,
    "tax": 10.5,
    "tags": []

import com.google.common.annotations.J2ktIncompatible;
import java.io.Serializable;
import java.util.Comparator;
import org.jspecify.annotations.Nullable;

/** An ordering for a pre-existing comparator. */
@GwtCompatible
final class ComparatorOrdering<T extends @Nullable Object> extends Ordering<T>
    implements Serializable {
  final Comparator<T> comparator;

Wenn Sie also den Artikel mit der ID `foo` bei der *Pfadoperation* anfragen, wird (ohne die Defaultwerte) die Response sein:

```JSON
{
    "name": "Foo",
    "price": 50.2
}
```

/// info

In Pydantic v1 hieß diese Methode `.dict()`, in Pydantic v2 wurde sie deprecated (aber immer noch unterstützt) und in `.model_dump()` umbenannt.

 * It includes static methods for each HTTP method that return a CurlRequest object.
 *
 * <p>Example usage:</p>
 * <pre>
 * CurlRequest request = Curl.get("http://example.com");
 * </pre>
 *
 * <p>Supported HTTP methods:</p>
 * <ul>
 *   <li>GET</li>
 *   <li>POST</li>
 *   <li>PUT</li>
 *   <li>DELETE</li>
 *   <li>HEAD</li>
 *   <li>OPTIONS</li>

    count += len;
  }

  @Override
  public void write(int b) throws IOException {
    out.write(b);
    count++;
  }

  // Overriding close() because FilterOutputStream's close() method pre-JDK8 has bad behavior:
  // it silently ignores any exception thrown by flush(). Instead, just close the delegate stream.
  // It should flush itself if necessary.
  @Override
  public void close() throws IOException {