Python PySerial.How to know if a port is already open?

Question

I\'m trying to write an App that uses serial ports in a Linux PC, using python and PySerial. But in this PC there are other Apps using serial ports. How can I know if a port is

Answer 1

Check the return output of Serial.serial, it returns an invalid exception that can be caught

http://pyserial.sourceforge.net/pyserial_api.html http://pyserial.sourceforge.net/pyserial_api.html#serial.SerialException

Other than that, if the port is in fact closed when your program attempts to access it, the error thrown is non-fatal and is fairly clear about the reason it failed.