[Tutor] Use of POPEN

[Bob Gordon]

I am trying to redirect a spawned program's input stream using the following:
 
import os
pipe = os.popen('myprog.exe', 'w')
pipe.write('stuff\n')
pipe.close()
 
when I perform the write, I receive the following error msg:

Traceback (most recent call last):
  File "<stdin>", line 1, in ?
IOError: [Errno 22] Invalid argument

I am running under Windows2000.  When launched, myprog.exe starts by printing some information to stdout and then waits for input from stdin.
 
Do I also have to redirect stdout using popen2, for example, or will the output from myprog go to the bit bucket?  If the later, then why do I receive the error dealing with stdin?
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