Keep a subprocess alive and keep giving it commands? Python

Question

If I spawn a new subprocess in python with a given command (let\'s say I start the python interpreter with the python command), how can I send new

Answer 1

Don't.

If you want to send commands to a subprocess, create a pty and then fork the subprocess with one end of the pty attached to its STDIN.

Here is a snippet from some of my code:

RNULL = open('/dev/null', 'r')
WNULL = open('/dev/null', 'w')

master, slave = pty.openpty()
print parsedCmd
self.subp = Popen(parsedCmd, shell=False, stdin=RNULL,
                      stdout=WNULL, stderr=slave)

In this code, the pty is attached to stderr because it receives error messages rather than sending commands, but the principle is the same.