Subprocess "python file.py" – how to ensure runs in python3?

Question

I'm running the following piece of code:

p = subprocess.getoutput("python ./file.py")

How do I ensure the python version used is python3?

Thanks!

you might want to change the code so that it runs on both: p=subprocess.check_output('python ./file.py < input.txt', shell=True) — Pynchia
– Pynchia, Commented Nov 22, 2015 at 22:34

donkopotamus · Accepted Answer · 2015-11-22 22:41:57Z

1

Assuming your controlling script is running in python 3, and thus you are simply wanting to run a subprocess of an identical version of python, then try:

import sys
p = subprocess.getoutput("'{}' ./file.py < input.txt".format(sys.executable))

edited Nov 22, 2015 at 22:41

answered Nov 22, 2015 at 22:29

donkopotamus

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wallyk · Accepted Answer · 2015-11-22 22:33:25Z

0

The obvious way to ensure python 3.x is used is:

p = subprocess.getoutput("python3 ./file.py < input.txt")

answered Nov 22, 2015 at 22:33

wallyk

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