Communicating with xterm

[Roy, Anirban (Anirban)]

Hi,
I am new to Pythion world.

My Objective : I want to open an Xterm and try to send message to that
xterm. I dont want to use Expect script.


I have written a small program

import os
import commands
import pty
import re
import tty

(master,slave) = pty.openpty()
print "master = %d , slave = %d" %(master, slave)
paths = os.ttyname(slave)
print "paths = %s" %(paths)
p = re.compile('/(.*)/(.*)/(.*)')
m = p.split(paths)
cmd = '-S' + str(m[3]) + '/' + str(slave) 
pid = os.fork()
if pid == 0:
   os.setsid() 
   os.dup2(slave, 0)
   os.dup2(slave, 1)
   os.dup2(slave, 2)
   os.close(master)
   os.close(slave)
   os.execv('/usr/openwin/bin/xterm',["xterm" , cmd])
else :  
   print "xterm pid = ", pid
   while True:
      os.write(master,"bash")
      os.fsync(master)
      os.write(master,"ls")
      os.fsync(master)
      os.write(master,"ls")
      os.fsync(master)
      os.write(master,"ls")
      os.fsync(master)
      os.write(master,"ls")
      os.fsync(master)
      data = os.read(0,20)
      print "data is %s" %(data)
      os.write(master,data)



But It is not working. Xterm window doesnot show the Shell prompt. 

Can somebody please give some clue , how to progress .
Is there some example code for xterm communication with Python code.

regards
Anirban Roy