from typing import Union

from fastapi import FastAPI
from pydantic import BaseModel


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


app = FastAPI()


@app.post("/items/")
async def create_item(item: Item):
    item_dict = item.dict()
    if item.tax:
        price_with_tax = item.price + item.tax

from fastapi import FastAPI, Query
from pydantic import BaseModel, Field
from typing_extensions import Annotated, Literal

app = FastAPI()


class FilterParams(BaseModel):
    model_config = {"extra": "forbid"}

    limit: int = Field(100, gt=0, le=100)
    offset: int = Field(0, ge=0)
    order_by: Literal["created_at", "updated_at"] = "created_at"
    tags: list[str] = []


@app.get("/items/")

import jcifs.dcerpc.ndr.NdrException;
import jcifs.dcerpc.ndr.NdrObject;
import jcifs.dcerpc.ndr.NdrSmall;


@SuppressWarnings ( "all" )
public class lsarpc {

    public static String getSyntax () {
        return "12345778-1234-abcd-ef00-0123456789ab:0.0";
    }

    public static class LsarQosInfo extends NdrObject {

        public int length;
        public short impersonation_level;
        public byte context_mode;

import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;

import jakarta.annotation.PostConstruct;

public class SearchLogHelper {
    private static final Logger logger = LogManager.getLogger(SearchLogHelper.class);

    protected long userCheckInterval = 10 * 60 * 1000L;// 10 min

    protected int userInfoCacheSize = 10000;

```Python hl_lines="1"
{!../../docs_src/first_steps/tutorial001.py!}
```

`FastAPI` là một Python class cung cấp tất cả chức năng cho API của bạn.

/// note | "Chi tiết kĩ thuật"

`FastAPI` là một class kế thừa trực tiếp `Starlette`.

Bạn cũng có thể sử dụng tất cả <a href="https://www.starlette.io/" class="external-link" target="_blank">Starlette</a> chức năng với `FastAPI`.

///

  }

  @Suppress("UNCHECKED_CAST")
  @Throws(SSLPeerUnverifiedException::class)
  override fun getPeerCertificates(): Array<Certificate> {
    return if (certificates.isEmpty()) {
      throw SSLPeerUnverifiedException("peer not authenticated")
    } else {
      certificates as Array<Certificate>
    }
  }

  @Throws(
    SSLPeerUnverifiedException::class,
  )
  override fun getPeerCertificateChain(): Array<X509Certificate> {

import java.util.concurrent.atomic.AtomicInteger;

/**
 * Utility {@link RemovalListener} implementations intended for use in testing.
 *
 * @author mike nonemacher
 */
@GwtCompatible(emulated = true)
class TestingRemovalListeners {

  /** Returns a new no-op {@code RemovalListener}. */
  static <K, V> NullRemovalListener<K, V> nullRemovalListener() {
    return new NullRemovalListener<>();
  }

import jakarta.annotation.Resource;

/**
 * @author ma2tani
 */
public class AdminDictProtwordsAction extends FessAdminAction {

    public static final String ROLE = "admin-dict";

    private static final Logger logger = LogManager.getLogger(AdminDictProtwordsAction.class);

    // ===================================================================================

 * </p>
 *
 * <pre>
 * BeanDesc beanDesc = BeanDescFactory.getBeanDesc(Foo.class);
 * </pre>
 * <p>
 * {@link BeanDesc}はキャッシュされます。 キャッシュをクリアするには{@link DisposableUtil#dispose()}
 * を呼び出してください。
 * </p>
 *
 * @author higa
 * @see BeanDesc
 * @see DisposableUtil
 */
public abstract class BeanDescFactory {

    /** 初期化済みなら{@literal true} */
    private static volatile boolean initialized;

Here’s a [sample event listener](https://github.com/square/okhttp/blob/master/samples/guide/src/main/java/okhttp3/recipes/PrintEventsNonConcurrent.java) that prints each event with a timestamp.

```java
class PrintingEventListener extends EventListener {
  private long callStartNanos;

  private void printEvent(String name) {
    long nowNanos = System.nanoTime();
    if (name.equals("callStart")) {