def METHOD_NAME(variable_name: Optional[pulumi.Input[str]] = None,
                        opts: Optional[pulumi.InvokeOptions] = None) -> pulumi.Output[GetVariableResult]:
    """
    This operation retrieves a single variable, given its name and the subscription it was created at.
    Azure REST API version: 2022-08-01-preview.
    :param str variable_name: The name of the variable to operate on.
    """
    ...