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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 _resolve_api_id(self):
        '''
        returns an Api Id that matches the given api_name and the hardcoded _Swagger.AWS_API_DESCRIPTION
        as the api description
        '''
        apis = __salt__['boto_apigateway.describe_apis'](name=self.rest_api_name,
                                                         description=_Swagger.AWS_API_DESCRIPTION,
                                                         **self._common_aws_args).get('restapi')
        if apis:
            if len(apis) == 1:
                self.restApiId = apis[0].get('id')
            else:
                raise ValueError('Multiple APIs matching given name {0} and '
                                 'description {1}'.format(self.rest_api_name, self.info_json))