Hi,
I'm new to python and trying to learn serial communication using python.In this 
process i'm facing serial port issues.Please find the attached COMPorttest.py 
file ,correct me if anything wrong in the code.With my code it's always goes in 
to exception.I noted down the the COM port number  from windows device manager 
list. 
Operating system: XPPython Ver: 2.5Pyserial: 2.5
Even i tried from python shell passing below commands
import serialser=ser=serial.Serial(port=21,baudrate=9600)
I observe below error on python shell
File "C:\Python25\lib\serial\serialwin32.py", line 55, in open    raise 
SerialException("could not open port: %s" % msg)SerialException: could not open 
port: (2, 'CreateFile', 'The system cannot find the file specified.')
Thanks in advance.
Best Regards,Chandan.


import serial


def checkPort():
    """
    This function reads the serial port and writes it.
    """
    try:
        ser = serial.Serial(
            port=21,
            baudrate=9600,
            bytesize=serial.EIGHTBITS,
            parity=serial.PARITY_NONE,
            stopbits=serial.STOPBITS_ONE,
            timeout=10          
            )
       
        if ser.isOpen():     
            print "Port Open"

        else:           
           ser.close()
           print"port closed"
           
    except serial.serialutil.SerialException:
        print "Failed to open port"



checkPort()

<<attachment: DeviceManager.PNG>>

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