redirect output of jar file in python

Question

I want to redirect the output of my jar in a file with python I have tried the following but it didn't work out

import sys
import subprocess

cmdargs = sys.argv
fname = str(cmdargs[1])
input = '../res/test/'+fname
output = '../res/res/'+fname
subprocess.Popen(['java', '-jar', '../res/chemTagger2.jar',input,'>',output])

the output is print in the console

Possible duplicate of Write to file descriptor 3 of a Python subprocess.Popen object See also stackoverflow.com/questions/18421757/… — fredtantini
– fredtantini, Commented Dec 9, 2016 at 11:41

Avihoo Mamka · Accepted Answer · 2016-12-09 11:54:02Z

1

You can redirect the subprocess.Popen stdout and stderr by using their parameters within the Popen command, as follows:

import sys
import subprocess

cmdargs = sys.argv
fname = str(cmdargs[1])
input = '../res/test/' + fname
output = '../res/res/' + fname

with open(output, 'a') as f_output:
    subprocess.Popen(['java', '-jar', '../res/chemTagger2.jar',input], stdout=f_output)

answered Dec 9, 2016 at 11:54

Avihoo Mamka

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