Call command-line oriented script from another python script -

i using script written in python uses argparse module it's arguments command line. try modify file less possible various people work on it.

ex: script called clscript.py , call

python clscript.py -option1 arg1 -flag1 -option2 arg2 

but i'm facing case automate things 1 level higher , automatically launch script wide range of script-generated arguments.

i keep using existing organisation of options , flags available in script.

for example, when run clscript.py toplevelscript.py through :

subprocess.call("python clscript.py -option1 arg1 -flag1 -option2 arg2") 

,and see output going wrong, stop execution toplevelscript.py, clscript.py continue run independently in python process have kill manually. cannot neither launch toplevelscript.py in debug mode stop @ breakpoint in clscript.py.

i inside python, without building command line string , launching clscript.py subprocess. every call remains attached same original launch, function call, , not creating multiple python threads subprocess.call() .

something passing list of string options, flags , arguments somehow script maybe?

is there like

import clscript.py clsimulator(clscript,["-option1",arg1,"-flag1","-option2",arg2]) 

first of all, use http://docs.python.org/2/library/subprocess.html#subprocess.popen , not subprocess.call():

import subprocess  child = subprocess.popen(     ['python', 'clscript.py', '-option1', 'arg1', '-flag1', '-option2', 'arg2'],     stdin=subprocess.pipe,     stdout=subprocess.pipe,     stderr=subprocess.pipe ) 

please notice first argument pass array of strings want.
secondly redirection of standard file descriptors important. see http://docs.python.org/2/library/subprocess.html#subprocess.pipe.
have child variable holds instance of popen class.
can instance?

# check if child terminated , possibly returncode child.poll() # write child's standard input file-like object accessible child.stdin # read child's standard output , standard error file-like objects accesible child.stdout child.stderr 

you said wanted detect if goes wrong in child process it's output.
don't find stdout , stderr quite useful case?
wanted terminate child if detected went wrong.

child.kill() child.terminate() child.send_signal(signal) 

if in end sure went want let child finalize normally, should use

child.wait() 

or better

child.communicate() 

because communicate handle lots of output properly.

good luck!