# Pfad-Parameter { #path-parameters }

Sie können Pfad-„Parameter“ oder -„Variablen“ mit der gleichen Syntax deklarieren, welche in Python-<abbr title="Formatstring – Formatierter String: Der String enthält Ausdrücke, die mit geschweiften Klammern umschlossen sind. Solche Stellen werden durch den Wert des Ausdrucks ersetzt">Formatstrings</abbr> verwendet wird:

{* ../../docs_src/path_params/tutorial001_py310.py hl[6:7] *}

public class InvalidQueryExceptionTest extends UnitFessTestCase {

    @Test
    public void test_constructor_withMessageCodeMessageAndCause() {
        // Setup
        final String message = "Invalid query syntax error";
        final Exception cause = new RuntimeException("Query parsing failed");
        final VaMessenger<FessMessages> messageCode = messages -> messages.addErrorsInvalidQueryUnknown(UserMessages.GLOBAL_PROPERTY_KEY);

import okio.Buffer
import okio.BufferedSource
import okio.ByteString
import okio.ForwardingSource
import okio.Source
import okio.buffer

/**
 * Streaming decoder of data encoded following Abstract Syntax Notation One (ASN.1). There are
 * multiple variants of ASN.1, including:
 *
 *  * DER: Distinguished Encoding Rules. This further constrains ASN.1 for deterministic encoding.
 *  * BER: Basic Encoding Rules.
 *

      new PercentEscaper(URL_FORM_PARAMETER_OTHER_SAFE_CHARS, true);

  /**
   * Returns an {@link Escaper} instance that escapes strings so they can be safely included in <a
   * href="https://url.spec.whatwg.org/#syntax-url-path-segment">URL path segments</a>. The returned
   * escaper escapes all non-ASCII characters, even though <a
   * href="https://url.spec.whatwg.org/#url-code-points">many of these are accepted in modern

* den Pfad-Parameter `item_id` mit `Path` deklarieren
* sie in einer anderen Reihenfolge haben
* nicht `Annotated` verwenden

... möchten, dann hat Python eine kleine Spezial-Syntax dafür.

Übergeben Sie `*`, als den ersten Parameter der Funktion.

# Path Parameters { #path-parameters }

You can declare path "parameters" or "variables" with the same syntax used by Python format strings:

{* ../../docs_src/path_params/tutorial001_py310.py hl[6:7] *}

The value of the path parameter `item_id` will be passed to your function as the argument `item_id`.

So, if you run this example and go to [http://127.0.0.1:8000/items/foo](http://127.0.0.1:8000/items/foo), you will see a response of:

```JSON

Cela s'applique également à `response_model_by_alias` qui fonctionne de manière similaire.

///

{* ../../docs_src/response_model/tutorial005_py310.py hl[29,35] *}

/// tip | Astuce

La syntaxe `{"name", "description"}` crée un `set` avec ces deux valeurs.

Elle est équivalente à `set(["name", "description"])`.

///

#### Utiliser des `list` au lieu de `set` { #using-lists-instead-of-sets }

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### Expanding existing distributed setup

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