```Python
say_hi(name=None)  # This works, None is valid 🎉
```

A boa notícia é, quando você estiver no Python 3.10 você não precisará se preocupar mais com isso, pois você poderá simplesmente utilizar o `|` para definir uniões de tipos:

{* ../../docs_src/python_types/tutorial009c_py310.py hl[1,4] *}

E então você não precisará mais se preocupar com nomes como `Optional` e `Union`. 😎

#### Tipos genéricos { #generic-types }

The important thing to keep in mind is that the `sub` key should have a unique identifier across the entire application, and it should be a string.

## Check it { #check-it }

                    slug = slugify(visible_text_extractor.extract_visible_text(title))
                    if slug in permalinks:
                        # If the slug is already used, append a number to make it unique
                        count = 1
                        original_slug = slug
                        while slug in permalinks:
                            slug = f"{original_slug}_{count}"

			Optional:    true,
			Type:        "number",
		},
		config.HelpKV{
			Key:         target.NATSStreamingClusterID,
			Description: "[DEPRECATED] unique ID for NATS streaming cluster",
			Optional:    true,
			Type:        "string",
		},
		config.HelpKV{
			Key:         config.Comment,
			Description: config.DefaultComment,
			Optional:    true,

        }

        refresh();
    }

    /**
     * Generates a unique ID for a document based on session ID and URL.
     * Uses hashing for long IDs to ensure they fit within OpenSearch limits.
     *
     * @param sessionId The session ID.
     * @param url The URL.
     * @return The generated unique ID.
     */
    private String getId(final String sessionId, final String url) {

				continue
			}

			// No IPs seem to intersect, this means that bucket exists but has
			// different IP addresses perhaps from a different deployment.
			// bucket names are globally unique in federation at a given
			// path prefix, name collision is not allowed. We simply log
			// an error and continue.
			bucketsInConflict.Add(bucket)
		}
	}

### Eine benutzerdefinierte Funktion zur Erzeugung einer eindeutigen ID erstellen { #custom-generate-unique-id-function }

FastAPI verwendet eine **eindeutige ID** für jede *Pfadoperation*, die für die **Operation-ID** und auch für die Namen aller benötigten benutzerdefinierten Modelle für Requests oder Responses verwendet wird.

### Função personalizada para gerar IDs exclusivos { #custom-generate-unique-id-function }

O FastAPI usa um **ID exclusivo** para cada *operação de rota*, ele é usado para o **ID de operação** e também para os nomes de quaisquer modelos personalizados necessários, para requisições ou respostas.

            int threadCount = 20;
            ExecutorService executor = Executors.newFixedThreadPool(threadCount);
            CountDownLatch latch = new CountDownLatch(threadCount);

            // Each thread uses unique data to sign
            byte[][] results = new byte[threadCount][128];

            for (int t = 0; t < threadCount; t++) {
                final int threadId = t;
                executor.submit(() -> {

			Key:         RolePolicy,
			Description: "policies to apply for plugin authorized users" + defaultHelpPostfix(RolePolicy),
			Type:        "string",
		},
		config.HelpKV{
			Key:         RoleID,
			Description: "unique ID to generate the ARN" + defaultHelpPostfix(RoleID),
			Optional:    true,
			Type:        "string",
		},
		config.HelpKV{
			Key:         config.Comment,
			Description: config.DefaultComment,