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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 create_app(cls, port):
 """Create a new instance of FrontEndApp that listens on port with a hostname of 0.0.0.0 :param int port: The port FrontEndApp is to listen on :return: A new instance of FrontEndApp wrapped in GeventServer :rtype: GeventServer """

        app = FrontEndApp()
        app_server = GeventServer(app, port=port, hostname='0.0.0.0')
        return app_server