### Handle Default Configuration Variable Values

Source: https://botocore.amazonaws.com/v1/documentation/api/latest/index.html

Replaces the removed default argument in session.get_config_variable() by using a logical OR expression.

```python
value = session.get_config_variable() or 'default value'
```

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

### Retrieve Service Event Name in Botocore

Source: https://botocore.amazonaws.com/v1/documentation/api/latest/index.html

Use the service model's hyphenized service ID to determine the correct event name for registration.

```python
from botocore.session import Session

session = Session()
client = session.create_client('elbv2')
service_event_name = client.meta.service_model.service_id.hyphenize()
```

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