problem with PIPE

[Dhika Cikul]

Hello,

I'm new in Python, i don't know my subject is correct or wrong. I have
problem with my script. I want to change password with passwd password
in python without user submitted anything from keyboard. I get
tutorial that i must use pipe to process this. And this is my code :

[code]

   1.
   2. #!/usr/bin/python
   3.
   4. import os
   5.
   6. COMMAND = 'passwd'
   7. PASSWD  = 'mypassword'
   8.
   9. # open a pipe to passwd program and
  10. # write the data to the pipe
  11. p = os.popen("%s" % COMMAND, 'w')
  12. p.write(PASSWD)
  13. p.write('\n')
  14. p.write(PASSWD)
  15. p.close()
  16.
[/code]


but i got this error :

[output]
    [cp at server cp]$ ./password
    Changing password for user cp.
    Changing password for cp
    (current) UNIX password: passwd: Authentication token manipulation error
[/output]

Anyone can help me how to write to pipe.. i try several method, and always fail.

Thank's
-- 
Dhika Cikul