### Install Older ruamel.yaml Version

Source: https://github.com/pycontribs/ruamel-yaml/blob/master/README.md

Use this command to install a version of ruamel.yaml prior to 0.18.0, which introduced breaking changes by deprecating old PyYAML functions. This provides time to update code.

```Shell
pip install "ruamel.yaml<0.18.0"
```

--------------------------------

### Registering Dataclass with ruamel-yaml (Python)

Source: https://github.com/pycontribs/ruamel-yaml/blob/master/README.md

This snippet demonstrates how to register a Python dataclass with the ruamel-yaml library using decorators. This allows ruamel-yaml to automatically handle the serialization and deserialization of instances of the decorated class.

```Python
@yaml.register_class
@dataclass
class ...
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.