David Liang wrote:
Hello,
Sorry for the newbie question. How do I run a program that could
block, waiting for user input, using subprocess.Popen? For example,
from subprocess import *
def foo():
a = Popen(['python'] ...)
I want to be able to get input from the user and send input to the
subprocess, printing stdout and stderr as data becomes available, then
return once the subprocess exits. Is it possible to send to the
subprocess keyboard interrupts, EOF, and such?
I tried doing stdout=PIPE, stderr=PIPE, stdin=PIPE. I tried using
communicate(), but could only call it once; subsequent calls raised
"ValueError: I/O operation on closed file."
And both a.stdout.read() and a.stderr.read() blocked the program. Any
help would be much appreciated.
-David
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============================================
David;
Take a look at Section 14.1.2 of the Python Library pdf reference. The
popen3 should interest you. It allows 2 way communication with a
'child' process.
I was going to include some samples, but it seems I took them off when
that project terminated. (So they are buried somewhere in storage - sorry.)
I'm running Ver. 2.5.2 for mass compatibility.
Note:
I never tried redirection of the mouse. Just the keyboard, which
worked very well for me. In my case "Parent" controlled conversation.
In essence, treating 'child' as a subroutine. 'Child' included Unix
scripts, Unix programs, and some third party programs. Try to have
your "parent" program NOT talk to the screen while in this mode. :)
Steve
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