Communicate multiple times with a process without breaking the pipe?

by

I think you misunderstand communicate…

http://docs.python.org/library/subprocess.html#subprocess.Popen.communicate

communicate sends a string to the other process and then waits on it to finish… (Like you said waits for the EOF listening to the stdout & stderror)

What you should do instead is:

proc.stdin.write('message')

# ...figure out how long or why you need to wait...

proc.stdin.write('message2')

(and if you need to get the stdout or stderr you’d use proc.stdout or proc.stderr)

More Related Contents:

  1. How do I use subprocess.Popen to connect multiple processes by pipes?
  2. How to use `subprocess` command with pipes
  3. Retrieving the output of subprocess.call() [duplicate]
  4. Multiple pipes in subprocess
  5. Pipe subprocess standard output to a variable [duplicate]
  6. File not found error when launching a subprocess containing piped commands
  7. subprocess readline hangs waiting for EOF
  8. link several Popen commands with pipes
  9. Python subprocess: how to use pipes thrice? [duplicate]
  10. real time subprocess.Popen via stdout and PIPE
  11. Python – how to execute shell commands with pipe, but without ‘shell=True’?
  12. Store output of subprocess.Popen call in a string [duplicate]
  13. Stop reading process output in Python without hang?
  14. How to open every file in a folder
  15. Intercepting stdout of a subprocess while it is running
  16. “OSError: [Errno 2] No such file or directory” while using python subprocess with command and arguments
  17. What’s the best way to duplicate fork() in windows?
  18. Process substitution not allowed by Python’s subprocess with shell=True?
  19. How to get output from subprocess.Popen(). proc.stdout.readline() blocks, no data prints out
  20. How do i use subprocesses to force python to release memory?
  21. Understanding python subprocess.check_output’s first argument and shell=True [duplicate]
  22. Why does passing variables to subprocess.Popen not work despite passing a list of arguments?
  23. How to catch exception output from Python subprocess.check_output()?
  24. How can I print and display subprocess stdout and stderr output without distortion?
  25. WindowsError [error 5] Access is denied
  26. Killing child process when parent crashes in python
  27. python subprocess with timeout and large output (>64K)
  28. How to terminate long-running computation (CPU bound task) in Python using asyncio and concurrent.futures.ProcessPoolExecutor?
  29. Advantages of subprocess over os.system
  30. What is the subprocess.Popen max length of the args parameter?

Leave a Comment