Running Bash commands in Python

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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?

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