Using subprocess with script using another version

Question

Can I use a script written in python 3.3 with the subprocess function to create a pipe between my script and another written in 2.7 ?

If the answer is yes should I be doing something like this?

import subprocess

output = subprocess.check_output(['scriptInV2.7.py', '-arg1', '-arg2'])
myFunctionInV3.3(output)

I am pretty new to python, sorry for my lack of comprehension

So you just want the output of one passed to another? Also have you actually tried what you have suggested? — Padraic Cunningham
– Padraic Cunningham, Commented May 6, 2015 at 9:35
@PadraicCunningham is it possible to run two versions Python2.x and Python3.x parallel on same machine ? Does that Shabang #! can do something here ? — ZdaR
– ZdaR, Commented May 6, 2015 at 9:42
@PadraicCunningham I want to pass argument from one script in Python3.3 to another script in Python2.7 and recover the result in the first script (Python3.3). I did not tried because I want to be sure that will be working before using this solution — Atnaize
– Atnaize, Commented May 6, 2015 at 9:47
Just try having the explicit path to the other Python you want to call before your script location, subprocess.check_output(['C:/Path/To/PythonX.X/Python.exe', 'scriptInV2.7.py', '-arg1', '-arg2']) — SuperBiasedMan
– SuperBiasedMan, Commented May 6, 2015 at 9:49

gauteh · Accepted Answer · 2015-05-06 10:21:01Z

4

You can use your suggested approach. Either specify the python executable in the shebang (you need both python 2 and 3 installed in parallel):

#! /usr/bin/env python2

and (in your python 3 calling script):

#! /usr/bin/env python3

or you can specify the interpreter when you are calling the script:

output = subprocess.check_output(['/usr/bin/python2', 'scriptInV2.7.py', '-arg1', '-arg2'])

(update with the path to your python2 executable).

edited May 6, 2015 at 10:21

answered May 6, 2015 at 9:50

gauteh

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jfs Over a year ago

note: the shebang approach is more flexibly (it works even on Windows via Python launcher).

Anthon · Accepted Answer · 2015-05-06 10:21:08Z

0

Yes you can do so. However check_output normally takes an executable file as the first parameter, so scriptInV2.7.py needs to have execute permission set and have a shebang line that invokes python2.7.

You probably better explicitly specify the python executable as the first list element.

edited May 6, 2015 at 10:21

answered May 6, 2015 at 9:50

Anthon

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