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

The good news is, once you are on Python 3.10 you won't have to worry about that, as you will be able to simply use `|` to define unions of types:

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

And then you won't have to worry about names like `Optional` and `Union`. 😎

#### Generic types { #generic-types }

</p>
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</a>
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("Commercial Contributor") hereby agrees to defend and indemnify every
other Contributor ("Indemnified Contributor") against any losses,
damages and costs (collectively "Losses") arising from claims, lawsuits
and other legal actions brought by a third party against the Indemnified
Contributor to the extent caused by the acts or omissions of such
Commercial Contributor in connection with its distribution of the Program

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    <img src="https://github.com/fastapi/fastapi/actions/workflows/test.yml/badge.svg?event=push&branch=master" alt="Test">
</a>
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</p>
<p align="center">
    FastAPI 框架，高效能，易於學習，快速開發，適用於生產環境
</p>
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   - Witness protocol achieves <5 second failover time
4. **Compatibility**: Works with Windows Server 2016+ and Azure Files

## Next Steps

1. **Immediate Actions**:
   - Set up Windows Server test environment
   - Create detailed technical specifications for Phase 1
   - Identify and evaluate Java RDMA libraries

2. **Phase 1 Kickoff**:
   - Begin SMB3 lease implementation

    @Mock
    SmbFileHandleImpl mockHandle;

    @Mock
    Configuration mockConfig;

    private SmbFileInputStream newStream() throws SmbException {
        // Constructor that avoids external I/O; stays in-memory
        when(mockTree.isSMB2()).thenReturn(true); // default SMB2 for simple happy-path
        return new SmbFileInputStream(mockFile, mockTree, mockHandle);
    }

    @BeforeEach

        int size = request.size();

        // Then
        // SMB2_HEADER_LENGTH + 4 bytes for tree disconnect structure
        int expectedSize = Smb2Constants.SMB2_HEADER_LENGTH + 4;
        // size8 method aligns to 8-byte boundary
        int alignedSize = (expectedSize + 7) & ~7;
        assertEquals(alignedSize, size);
    }

    @Test
    @DisplayName("Should write correct bytes to wire format")

				t.Fatalf("Expected %v but got %v", test.wantExpired, gotExpired)
			}
		})
	}
}

func TestEvalActionFromLifecycle(t *testing.T) {
	// Tests cover only ExpiredObjectDeleteAllVersions and DelMarkerExpiration actions
	numVersions := 4
	obj := ObjectInfo{
		Name:        "foo",
		ModTime:     time.Now().Add(-31 * 24 * time.Hour),
		Size:        100 << 20,
		VersionID:   uuid.New().String(),
		IsLatest:    true,

Le `Union` dans `Union[str, None]` permettra à votre éditeur de vous offrir un meilleur support et de détecter les erreurs.

///

## Validation additionnelle

Nous allons imposer que bien que `q` soit un paramètre optionnel, dès qu'il est fourni, **sa longueur n'excède pas 50 caractères**.

## Importer `Query`

Pour cela, importez d'abord `Query` depuis `fastapi` :