import subprocess
subprocess.call('pwd', shell=True)
subprocess.call('python date.py', shell=True)
subprocess.call('root -b -q -l Gauss.C', shell=True)

==============================

[kondo@lxplus041]~/python% python subprocess_test.py
/afs/cern.ch/user/k/kondo/python
2017-02-06 12:47:00

Applying ATLAS style settings...

root [0]
Processing Gauss.C...
Info in <TCanvas::Print>: png file Gauss4.png has been created