Can this be somehow overcome? Can a child process create a subprocess?

The problem is, I have a ready application which needs to call a Python script. This script on its own works perfectly, but it needs to call existing shell scripts.

Schematically the problem is in the following code:

parent.py

import subprocess
subprocess.call(['/usr/sfw/bin/python', '/usr/apps/openet/bmsystest/relAuto/variousSW/child.py','1', '2'])

child.py

import sys
import subprocess
print sys.argv[0]
print sys.argv[1]

subprocess.call(['ls -l'], shell=True)
exit

Running child.py

python child.py 1 2
  all is ok

Running parent.py

python  parent.py
Traceback (most recent call last):
  File "/usr/apps/openet/bmsystest/relAuto/variousSW/child.py", line 2, in ?
    import subprocess
ImportError: No module named subprocess
python subprocess
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