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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 start_server(self):
 """ Creates a pcaspy-server. .. note:: The server does not process requests unless :meth:`handle` is called regularly. """

        if self._server is None:
            self._server = SimpleServer()
            self._server.createPV(prefix=self._options.prefix,
                                  pvdb={k: v.config for k, v in self.interface.bound_pvs.items()})
            self._driver = PropertyExposingDriver(interface=self.interface,
                                                  device_lock=self.device_lock)
            self._driver.process_pv_updates(force=True)

            self.log.info('Started serving PVs: %s',
                          ', '.join((self._options.prefix + pv for pv in
                                     self.interface.bound_pvs.keys())))