```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 }

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("Commercial Contributor") hereby agrees to defend and indemnify every
other Contributor ("Indemnified Contributor") against any losses,
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/// note | Hinweis

   - 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

**FastAPI** n'impose pas de sens spécifique à chacune d'elle.

Les informations qui sont présentées ici forment une directive générale, pas des obligations.

Par exemple, quand l'on utilise **GraphQL**, toutes les actions sont effectuées en utilisant uniquement des opérations `POST`.

///

### Étape 4 : définir la **fonction de chemin**.

Voici notre "**fonction de chemin**" (ou fonction d'opération de chemin) :

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```Python
say_hi(name=None)  # Dit werkt, None is geldig 🎉
```

Het goede nieuws is dat als je eenmaal Python 3.10 gebruikt, je je daar geen zorgen meer over hoeft te maken, omdat je dan gewoon `|` kunt gebruiken om unions van types te definiëren:

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


Dan hoef je je geen zorgen te maken over namen als `Optional` en `Union`. 😎

#### Generieke typen