added [subprocess] tag

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deleted 26 characters in body

edited Jan 14, 2009 at 15:34

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I'm having problems redirecting stdio of another program using subprocess module. Just reading from stdout results in hanging, and Popen.communicate() works but it closes pipes after reading/writing. What's the easiest way to implement this?

I was playing around with this on windows:

import subprocess proc = subprocess.Popen('python -c "while True: print \'Hi %s!\' % raw_input()"', shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT) while True: proc.stdin.write('world\n') proc_read = proc.stdout.readlinesreadline()  for line in proc_read:  if lineproc_read:   print lineproc_read

I'm having problems redirecting stdio of another program using subprocess module. Just reading from stdout results in hanging, and Popen.communicate() works but it closes pipes after reading/writing. What's the easiest way to implement this?

I was playing around with this on windows:

import subprocess proc = subprocess.Popen('python -c "while True: print \'Hi %s!\' % raw_input()"', shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT) while True: proc.stdin.write('world\n') proc_read = proc.stdout.readlines()  for line in proc_read:  if line:   print line

I'm having problems redirecting stdio of another program using subprocess module. Just reading from stdout results in hanging, and Popen.communicate() works but it closes pipes after reading/writing. What's the easiest way to implement this?

I was playing around with this on windows:

import subprocess proc = subprocess.Popen('python -c "while True: print \'Hi %s!\' % raw_input()"', shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT) while True: proc.stdin.write('world\n') proc_read = proc.stdout.readline() if proc_read: print proc_read

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asked Jan 14, 2009 at 14:07

Ivan Baldin

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How to properly interact with a process using subprocess module

I'm having problems redirecting stdio of another program using subprocess module. Just reading from stdout results in hanging, and Popen.communicate() works but it closes pipes after reading/writing. What's the easiest way to implement this?

I was playing around with this on windows:

import subprocess proc = subprocess.Popen('python -c "while True: print \'Hi %s!\' % raw_input()"', shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT) while True: proc.stdin.write('world\n') proc_read = proc.stdout.readlines() for line in proc_read: if line: print line

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How to properly interact with a process using subprocess module