List all available serial port with Python (linux/win)

import serial
import os.path

def scan():
    available = []
  
    if os.path.exists('/dev') == 1:
      for i in range(256):
          try:
            s = serial.Serial('/dev/ttyUSB%d' % i)
        
            available.append(s.portstr)
            s.close()

          except serial.SerialException:
            pass

    for i in range(256):
        try:
            s = serial.Serial(i)
            available.append(s.portstr)
            s.close()

        except serial.SerialException:
            pass
    return available

if __name__ == '__main__':
  print "Found ports:"
  for t in scan():
    print t

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