with open('com1', 'r') as f:

[gert]

On Apr 2, 8:53 pm, Kushal Kumaran <kushal.kuma... at gmail.com> wrote:
> On Thu, 2 Apr 2009 10:01:02 -0700 (PDT)
>
>
>
> gert <gert.cuyk... at gmail.com> wrote:
> > from subprocess import *
>
> > check_call(['mode', 'COM1:9600,N,8,1,P'],shell=True)
> > while True:
> >     with open('com1', 'r') as f:
> >         for line in f:
> >              print('line')
>
> > This works very well except for one thing. After a reboot I have to
> > launch 1 time any windows serial exe application no mater with one,
> > that just opens an closes the com port, before i can launch this
> > script. The script keeps on working even after closing and reopening
> > it, until i reboot the pc. Then again I have to launch one time a
> > serial.exe and close it again. The exe does not run anything in the
> > background it just does something in windows python does not do when
> > it reads from the com port after a fresh reboot.
>
> > And i really appreciate it if somebody knew what it was.
>
> I don't know why you're getting this behaviour, but have you tried using
> a python library for accessing the serial port? Seehttp://pyserial.wiki.sourceforge.net/pySerial.
>

I am sorry but I don't think pyserial will work on python3.x and I
also like to know whats going on before I consider it.
Maybe its a bug in open() on windows?