Trick to executing command line python out of Django

Is there a trick to executing this command line

cmd_line = 'python /home/amr/bin/addReadSnap.py -s ' + str(cycle)

using this function from django?

import sys
import os
import string

from subprocess import call, Popen

def exec_external_cmd(cmd_line):
retcode = None
try:
process = Popen(cmd_line, bufsize=2048, executable="/bin/
bash", shell=True, stdout=None, stderr=None)

while retcode == None:
retcode = process.poll()

if retcode < 0:
print >>sys.stderr, "Child was terminated by signal", -
retcode
elif retcode > 0:
print >>sys.stderr, "Child returned", retcode

except OSError, e:
print >>sys.stderr, "Execution failed:", e

return retcode

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