Remember I told you before that `Annotated` can be used to add metadata to your parameters in the [Python Types Intro](../python-types.md#type-hints-with-metadata-annotations){.internal-link target=_blank}?

Now it's the time to use it with FastAPI. 🚀

We had this type annotation:

//// tab | Python 3.10+

```Python
q: str | None = None
```

# Einführung in Python-Typen

Python hat Unterstützung für optionale „Typhinweise“ (Englisch: „Type Hints“). Auch „Typ Annotationen“ genannt.

Diese **„Typhinweise“** oder -Annotationen sind eine spezielle Syntax, die es erlaubt, den <abbr title="Zum Beispiel: str, int, float, bool">Typ</abbr> einer Variablen zu deklarieren.

Durch das Deklarieren von Typen für Ihre Variablen können Editoren und Tools bessere Unterstützung bieten.

{* ../../docs_src/handling_errors/tutorial006.py hl[2:5,15,21] *}

{* ../../docs_src/handling_errors/tutorial006.py hl[2:5,15,21] *}

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   * will silently add the missing nodes to the graph, then add the edge connecting them. We are not
   * using the proxy methods here as we want to test {@code addEdge} when the end-points are not
   * elements of the graph.
   */
  @Test
  public void addEdge_nodesNotInGraph() {
    assume().that(graphIsMutable()).isTrue();

    networkAsMutableNetwork.addNode(N1);

    } else {
      return next >>> 1;
    }
  }

  public void testCrc32cStrideTable() {
    int next = CRC32C_GENERATOR_FLIPPED;
    for (int i = 0; i < 12; i++) { // for 3 ints = 12 bytes in between each stride window
      next = (next >>> 8) ^ Crc32cHashFunction.Crc32cHasher.byteTable[next & 0xFF];
    }
    int[][] expected = new int[4][256];
    for (int b = 0; b < 4; ++b) {

            // Test PRINT share type
            setPrivateField(response, "shareType", Smb2TreeConnectResponse.SMB2_SHARE_TYPE_PRINT);
            assertEquals(Smb2TreeConnectResponse.SMB2_SHARE_TYPE_PRINT, response.getShareType(), "Should handle PRINT share type");
        }

        @Test
        @DisplayName("Should handle share flags")

	ast1, err := parser.ParseFile(fset, name, src, flags)
	if err != nil {
		if list, ok := err.(scanner.ErrorList); ok {
			// If err is a scanner.ErrorList, its String will print just
			// the first error and then (+n more errors).
			// Instead, turn it into a new Error that will return
			// details for all the errors.
			for _, e := range list {
				fmt.Fprintln(os.Stderr, e)
			}

            assertEquals(0, size % 8, "Size should be aligned to 8-byte boundary");
        }

        @ParameterizedTest
        @DisplayName("Should calculate size for various lock counts")
        @ValueSource(ints = { 0, 1, 2, 5, 10, 20, 50, 100 })
        void testSizeWithVariousLockCounts(int lockCount) {
            Smb2Lock[] locks = new Smb2Lock[lockCount];
            for (int i = 0; i < lockCount; i++) {