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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_sdk_download_stream(self, rest_api_id, api_gateway_stage=DEFAULT_STAGE_NAME, sdk_type='javascript'):
 # type: (str, str, str) -> file """Generate an SDK for a given SDK. Returns a file like object that streams a zip contents for the generated SDK. """

        response = self._client('apigateway').get_sdk(
            restApiId=rest_api_id, stageName=api_gateway_stage,
            sdkType=sdk_type)
        return response['body']