Python program to list all the serial ports connected to the computer

serial_scanner.py

import glob
import serial
import sys
import time

BAUDRATE = 115200

TIMEOUT = 0 

# Create list of potential ports
if sys.platform.startswith('win'):
    ports = ['COM' + str(i + 1) for i in range(256)]
elif sys.platform.startswith('linux') or sys.platform.startswith('cygwin'):
    ports = glob.glob('/dev/tty[A-Za-z]*')
else:
    raise EnvironmentError('Unsupported platform')

port_exceptions = ['dev/ttyprintk']
for port in port_exceptions:
    if port in ports:
        ports.remove(port)

def serial_scanner():
    global ports

    while True:           
        for port in ports:
            try:
                s = serial.Serial(port, BAUDRATE, timeout = TIMEOUT, rtscts = 0)
                print('Connected to %s'%port)
            except (OSError, serial.SerialException):
                pass
        time.sleep(1)

if __name__ == '__main__':
    serial_scanner()