Is there an easy way to execute an external java program from within a python script?

Question

I have a java program that i run with the following command

java -jar <program_name>.jar --<some_parameter> <some_filename>.csv

Within my python script I create the <some_filename>.csv. Then, I would like to execute the java program and use the program's stdout output in my python script.

Is there an easy way to do so?

Take a look at the [subprocess](https://docs.python.org/library/subprocess.html) module. — Anakhand, Nov 03 '20 at 09:55

score 1 · Answer 1 · answered Nov 03 '20 at 09:58

1

Try with subprocess:

import subprocess
result = subprocess.run([COMMAND LIST], stdout=subprocess.PIPE)
print(result.stdout)

[COMMAND LIST] is a string list of the words in the command separated by space

answered Nov 03 '20 at 09:58

Wasif

14,755
3
14
34

score 0 · Answer 2 · answered Nov 03 '20 at 10:02

Try with this:

import subprocess

p = subprocess.Popen(["java", "-jar <program_name>.jar --<some_parameter> <some_filename>.csv"],shell=True,stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, err = p.communicate()
if not out:
   print(err.rstrip().decode())
else:
   print(out.rstrip().decode())

Is there an easy way to execute an external java program from within a python script?

2 Answers2