On my local machine, I run a python script which contains this line
bashCommand = "cwm --rdf test.rdf --ntriples > test.nt"
os.system(bashCommand)
This works fine.
Then I run the same code on a server and I get the following error message
'import site' failed; use -v for traceback
Traceback (most recent call last):
File "/usr/bin/cwm", line 48, in <module>
from swap import diag
ImportError: No module named swap
So what I did then is I inserted a print bashCommand which prints me than the command in the terminal before it runs it with os.system().
Of course, I get again the error (caused by os.system(bashCommand)) but before that error it prints the command in the terminal. Then I just copied that output and did a copy paste into the terminal and hit enter and it works...
Does anyone have a clue what's going on?
Answer
Don't use os.system. It has been deprecated in favor of subprocess. From the docs: "This module intends to replace several older modules and functions: os.system, os.spawn".
Like in your case:
bashCommand = "cwm --rdf test.rdf --ntriples > test.nt"
import subprocess
process = subprocess.Popen(bashCommand.split(), stdout=subprocess.PIPE)
output, error = process.communicate()