How to use _validate_single_default method in lisa

Best Python code snippet using lisa_python

environment.py

Source:environment.py

...310        for node_runbook in self.runbook.nodes:311            self.create_node_from_exists(312                node_runbook=node_runbook,313            )314            has_default_node = self._validate_single_default(315                has_default_node, node_runbook.is_default316            )317        if self._retries > 0:318            # provide an unique id.319            self.id = f"{self._raw_id}-{self._retries}"320        self.remove_context()321        self._retries += 1322    def _validate_single_default(323        self, has_default: bool, is_default: Optional[bool]324    ) -> bool:325        if is_default:326            if has_default:327                raise LisaException("only one node can set isDefault to True")328            has_default = True329        return has_default330if TYPE_CHECKING:331    EnvironmentsDict = UserDict[str, Environment]332else:333    EnvironmentsDict = UserDict334class Environments(EnvironmentsDict):335    def __init__(336        self,...

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