How to execute linux commands from a python script

Question

When I use the linux shell I write module load numeca/open/61_numeca_mpi, I press enter, the program uploads the module licence, and then I write fine and press enter again. I wrote a Python script which does this.

import os

os.system("module load numeca/open/61_numeca_mpi")
os.system("fine")

It uploads the module licence but then it says

ERROR:105: Unable to locate a modulefile for 'fine'.

Any suggestions?

The problem with what you tried is that os.system opens a new shell for each command, this means that the fine you sent was in a different shell then the the module command before it — EarthDragon
– EarthDragon, Commented Jun 19, 2017 at 12:46

Akshay Apte · Accepted Answer · 2017-06-19 12:44:35Z

1

Try using the subprocess module:

import subprocess
p= subprocess.Popen(['module','load numeca/open/61_numeca_mpi"'],stdout=subprocess.PIPE,stdin=subprocess.PIPE)
p.stdin.write('fine')
p.communicate()[0]
p.stdin.close()

answered Jun 19, 2017 at 12:44

Akshay Apte

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Błotosmętek · Accepted Answer · 2017-06-19 12:38:49Z

0

Try executing both commands in the same shell, like this:

os.system("module load numeca/open/61_numeca_mpi && fine")

answered Jun 19, 2017 at 12:38

Błotosmętek

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