Note that both our subprocesses are opened with their stdins and stdoutsįrom internal pipes. PIPE) while True: # check if either sub-process has finished proc_a. # two_subprocesses.py import subprocess # start both `proc_a.py` and `proc_b.py` proc_a = subprocess. Prompt, reading a line of input, echoing that back and prompting for more input: Going to spawn will be kept very simple, doing nothing more than printing a The Two Sub-ProcessesĪs an illustration of what can be achieved, the two sub-processes that we are Which output comes from which process we’ll prepend output from process A withĪn A: and from process B with a B. Of the processes will be printed on stdout, but to enable us to differentiate These two pipes A and B will read their respective inputs. What we aim to end up with is a program that starts up two sub-processes, let’sĬall them A and B, and connects to two named pipes in the file system. The server, to provide a set of pre-scripted commands to each to get them in aĬertain state, and then a way of providing my own custom commands, to do some Basically, I wanted a program to start up the client and In this section we’ll do the same, but this time for two sub-processes.Ī use for this, and the original reason I first developed this, was for testingĪ client and server. We explored start a subprocess and controlling its input and output via
