python subprocess call background process in thread

I have a python script invoked with Python 2.7.15 spawning another python script using Python 3.8.5, so it matches your scenario. Print('Runner started! Runner output follows.')įor line in iter(p.stdout.readline, b''):Īnd the current time from runner.py will be displayed in the executor.py script:Ĭode: Select all Aaron% python executor.py P = Popen(, stdout=PIPE, bufsize=1) # Note the '-u' flag. My demo below works with the '-u' and it does nothing at all without the flag.Ĭode: Select all Aaron% cat runner.pyĬode: Select all Aaron% cat executor.py

It appears that you need to tell the spawned python process to not buffer its output by passing the '-u' flag. Maybe this will point you in the right direction or at least make you aware of the subprocess module if you haven't heard of it. Here is a snippet taken from one of the examples where you can write to the stdin of the spawned process (you can do something similar for reading from stdout as well):Ĭode: Select all proc = subprocess.Popen(, stdin=subprocess.PIPE) It covers writing to and reading from stdin and stdout of a subprocess: This is the Python 2.7 documentation for the subprocess module: Īnd I think this site has a great writeup with some examples on using the module. Run Background Process in Python Codeigo WebThe & runs the job in the. You can spawn a new process from Python 2.7 code (to run your Python 3 script) and set it up such that the stdin and stdout can be read and written to. Popen() os: 1 2 import os os.system() python run script in backgrund windows.

Using shellTrue enables all of the shell's features. Notes: Since shellTrue, the above uses command, not commandlist. I don't have any of my own examples I can provide, but are you familiar with the subprocess module in Python? It sounds like that may be what you want. If you want it to work with subprocess, you must specify shellTrue like: subprocess.call (command, shellTrue) This will allow you to run command in background.

Python subprocess call background process in thread