///

Run the example with:

<div class="termy">

```console
$ fastapi dev main.py

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

## Check it { #check-it }

Go to the interactive docs at: <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.

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


class User(BaseModel):
    username: str
    full_name: Union[str, None] = None


@app.put("/items/{item_id}")
async def update_item(
    *,
    item_id: int,

 * The tests use small stub subclasses to drive encode/decode paths and
 * validate batching, chaining, signing, and NT_CREATE_ANDX extended handling.
 */
class AndXServerMessageBlockTest {

    /**
     * Test stub for AndXServerMessageBlock to control read/write logic.
     */
    static class DummyAndXBlock extends AndXServerMessageBlock {
        int paramWordsWritten = 0;
        int bytesWritten = 0;
        int paramWordsRead = 0;

 * override {@code putAll} as well, either providing your own implementation, or delegating to the
 * provided {@code standardPutAll} method.
 *
 * <p><b>{@code default} method warning:</b> This class does <i>not</i> forward calls to {@code
 * default} methods. Instead, it inherits their default implementations. When those implementations
 * invoke methods, they invoke methods on the {@code ForwardingMap}.
 *

 * more simply:
 *
 * {@snippet :
 * CacheLoader<Key, Graph> loader = CacheLoader.from(key -> createExpensiveGraph(key));
 * }
 *
 * @author Charles Fry
 * @since 10.0
 */
@GwtCompatible
public abstract class CacheLoader<K, V> {
  /** Constructor for use by subclasses. */
  protected CacheLoader() {}

  /**
   * Computes or retrieves the value corresponding to {@code key}.
   *

     * might not run some of its listeners. The likely result is that the app will hang. (And of
     * course stack overflows are bad news in general. For example, we may have overflowed in the
     * middle of defining a class. If so, that class will never be loadable in this process.) The
     * best we can do (since logging may overflow the stack) is to let the error propagate. Because

<a href="https://docs.python.org/fr/3/library/string.html#format-string-syntax" class="external-link" target="_blank">formatage de chaîne Python</a> :


{* ../../docs_src/path_params/tutorial001.py hl[6:7] *}

La valeur du paramètre `item_id` sera transmise à la fonction dans l'argument `item_id`.

Donc, si vous exécutez cet exemple et allez sur <a href="http://127.0.0.1:8000/items/foo" class="external-link" target="_blank">http://127.0.0.1:8000/items/foo</a>,

import jakarta.validation.constraints.Size;

/**
 * Form class for creating mapping dictionary entries.
 * Mapping dictionaries allow administrators to define synonym mappings
 * where multiple input terms can be mapped to a single output term for search normalization.
 *
 */
public class CreateForm {

    /**
     * Creates a new CreateForm instance.
     */
    public CreateForm() {

import org.lastaflute.web.validation.theme.conversion.ValidateTypeFailure;

import jakarta.validation.constraints.Size;

/**
 * Form class for creating new synonym dictionary entries.
 * This form handles the creation of synonym mappings that expand
 * search queries to include related terms.
 *
 */
public class CreateForm {

    /**
     * Creates a new CreateForm instance.
     */
    public CreateForm() {
    }

 */

package jcifs.dcerpc.ndr;

/**
 * Represents an NDR small integer (1 byte unsigned) for DCE/RPC communication.
 * This class encapsulates a single byte value (0-255) in NDR format.
 */
public class NdrSmall extends NdrObject {

    /**
     * The small integer value (0-255)
     */
    public int value;

    /**
     * Constructs an NdrSmall with the specified value