Find all the connected serial ports (only tested on Linux)

findSerialPorts.py

import glob
import serial


def serial_ports():
    ports = glob.glob('/dev/tty[A-Za-z]*')

    working_ports = []
    for port in ports:
        try:
            ser = serial.Serial(port)
            ser.close()
            working_ports.append(port)
        except (OSError, serial.SerialException):
            pass

    return working_ports