pyserial script doesnt execute properly

[kishore]

On Mar 9, 2:19 pm, News123 <news... at free.fr> wrote:
> Hi,
>
>
>
> kishore wrote:
> > hello there
>
> > Iam using python 2.5.4
> > pyserial  2.4
> > pywin32-214
>
> > on windows 7
>
> > i hav a small test script written to query a serial device (arduino)
> > and get back reply appropriately
>
> > ////file: test.py
>
> > import serial
> > print 'hi'
> > ser=serial.Serial(port='\\.\COM2', baudrate=9600)
> > ser.close()
> > ser.open()
> > ser.write('1')
> > ser.readline()
> > ser.readline()
> > ser.close()
>
> > the device waits for '1' through its serial interface and print two
> > lines if it gets '1'
>
> > "Some Data found" and "Header received"
>
> > the script works on IDLE well when given one line at a time
>
> > but when given in command line as python test.py it prints hi and wait
> > forever
>
> Unfortunately I don't remember exacty, but try following:
>
> close IDLE and try then to start the script from the command line.
> I remember having had a problem with idle, that it did not always close
> the UART port
> (especially, when an error (e.g. syntax) occured before the close statement)
>
> bye
>
> N


Thanks for your response
i tried closing idle and the following code prints
port opened
Write failed

code:

import serial
import time
ser=serial.Serial(port='\\.\COM2', baudrate=9600)
if ser:
	print 'port opened'
ser.open()
if ser.write('1'):
	print 'Write success'
else:
	print 'write failed'

time.sleep(1)

a=ser.readline()
time.sleep(1)
b=ser.readline()
print b
ser.close()



I believe this might be a serial port access error.
how to solve this?
Any suggestions?