Python subprocess.Popen stdin interfering with stdout/stderr?

It seems like you might be trying to write data to the subprocess (via STDIN) as well as read its output (via STDOUT) interactively.

It seems like you might be trying to write data to the subprocess (via STDIN) as well as read its output (via STDOUT) interactively. As mentioned in the answer to this SO question, that is a no-no! You could use Popen.

Communicate, but that is a blocking call which will wait for all communication to finish (you can't poll as you do in your example).

Good link. I didn't understand the deadlocking issue before. I'm trying to get communicate working but it's not so far.

See my comment above. – tanders12 Oct 3 at 20:26 @tanders12: What problems are you having with communicate()? – jwd Oct 3 at 22:34 communicate() appears to buffer everything until the child exits.

I need it line buffered or unbuffered. I'm trying to accomplish this without changing the code in the child. Right now I'm attempting to make pexpect work and it looks promising.

– tanders12 Oct 3 at 22:42.

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