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When the event handler for this event is entered the ser.num property is automatically switched to the port for which this event was generated. Another on_ser_data_arrival event on a particular port is never generated until the previous one is processed. Use ser.getdata method to extract the data from the RX buffer.
You don't have to process all data in the RX buffer at once. If you exit the on_ser_data_arrival event handler while there is still some unprocessed data in the RX buffer another on_ser_data_arrival event will be generated immediately.
This event is not generated for a particular port when buffer redirection is set for this port through the ser.redir method.