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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:
 async def start(self):
 """ Initialize and start WebServer """

        logging.info('Starting server, listening on %s.', self.port)
        runner = web.AppRunner(self)
        await runner.setup()
        site = web.TCPSite(runner, '', self.port)
        await site.start()