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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def _get_current_deployment_id(self):
        '''
        Helper method to find the deployment id that the stage name is currently assocaited with.
        '''
        deploymentId = ''
        stage = __salt__['boto_apigateway.describe_api_stage'](restApiId=self.restApiId,
                                                               stageName=self._stage_name,
                                                               **self._common_aws_args).get('stage')
        if stage:
            deploymentId = stage.get('deploymentId')
        return deploymentId