* different input keys. This test verifies that each possible 1-bit key delta achieves avalanche.
   *
   * <p>For more information: http://burtleburtle.net/bob/hash/avalanche.html
   */
  static void checkAvalanche(HashFunction function, int trials, double epsilon) {
    Random rand = new Random(0);
    int keyBits = 32;
    int hashBits = function.bits();

例如，您可以有一个名为 `main.py` 的文件，其中包含以下内容：

```Python hl_lines="3"
import os

name = os.getenv("MY_NAME", "World")
print(f"Hello {name} from Python")
```

/// tip

<a href="https://docs.python.org/3.8/library/os.html#os.getenv" class="external-link" target="_blank">`os.getenv()`</a> 的第二个参数是要返回的默认值。

如果没有提供默认值，默认为 `None`，此处我们提供了 `"World"` 作为要使用的默认值。

///

然后，您可以调用该 Python 程序：

<div class="termy">

```console

   * value is <a href="#bitEquals">bitwise equal</a> to the expected value.
   *
   * <p>May <a
   * href="http://download.oracle.com/javase/7/docs/api/java/util/concurrent/atomic/package-summary.html#Spurious">
   * fail spuriously</a> and does not provide ordering guarantees, so is only rarely an appropriate
   * alternative to {@code compareAndSet}.
   *
   * @param i the index
   * @param expect the expected value

import java.security.MessageDigest;

/**
 * Implements the MD4 message digest algorithm in Java.
 * <p>
 * <b>References:</b>
 * <ol>
 *   <li> Ronald L. Rivest,
 *        "<a href="http://www.roxen.com/rfc/rfc1320.html">
 *        The MD4 Message-Digest Algorithm</a>",
 *        IETF RFC-1320 (informational).
 * </ol>
 *
 * <p><b>$Revision: 1.2 $</b>
 * @author  Raif S. Naffah
 */

 * commandline with the <code>-Dproperty.name=value</code> VM parameter
 * will override properties from the configuration file.
 * <p>
 * There are several ways to set jCIFS properties. See
 * the <a href="../overview-summary.html#scp">overview page of the API
 * documentation</a> for details.
 */

public class Config {

public static int socketCount = 0;

    /**
     * The static <code>Properties</code>.
     */

## Technische Details

Nur ein technisches Detail für die neugierigen Nerds. 🤓

In der technischen ASGI-Spezifikation ist dies Teil des <a href="https://asgi.readthedocs.io/en/latest/specs/lifespan.html" class="external-link" target="_blank">Lifespan Protokolls</a> und definiert Events namens `startup` und `shutdown`.

/// info

        versioning.setLastUpdatedTimestamp(timestamp);
        return sv;
    }

    // the format written by Maven 2
    // (https://maven.apache.org/ref/2.2.1/maven-repository-metadata/repository-metadata.html)
    private static void addSnapshotVersionLegacy(Versioning versioning, Date timestamp, int buildNumber) {
        Snapshot snapshot = new Snapshot();
        snapshot.setBuildNumber(buildNumber);

            Type[Response],
            Doc(
                """
                The default response class to be used.

                Read more in the
                [FastAPI docs for Custom Response - HTML, Stream, File, others](https://fastapi.tiangolo.com/advanced/custom-response/#default-response-class).

                **Example**

                ```python
                from fastapi import FastAPI

labels.facet_contentLength_250kto500k	=	250kb - 500kb
labels.facet_contentLength_1mto5m	=	1mb - 5mb
labels.facet_contentLength_5m	=	5mb -  
labels.facet_filetype_title	=	Type de fichier
labels.facet_filetype_html	=	HTML
labels.facet_filetype_word	=	MS Word
labels.facet_filetype_excel	=	MS Excel
labels.facet_filetype_powerpoint	=	MS PowerPoint
labels.facet_filetype_odt	=	ODF Word
labels.facet_filetype_ods	=	Tableur ODF

{!../../docs_src/query_params_str_validations/tutorial006.py!}
```

/// info | "Informação"

Se você nunca viu os `...` antes: é um valor único especial, faz <a href="https://docs.python.org/3/library/constants.html#Ellipsis" class="external-link" target="_blank">parte do Python e é chamado "Ellipsis"</a>.

///

Dessa forma o **FastAPI** saberá que o parâmetro é obrigatório.