How to get 'java -version' output through python

Question

I tried os.popen and the like ways. But it does not seem to work for me. I'm wondering if there's anything different between a command 'echo xxxx' and 'java -version', and how can I get 'java -version' output with python code.

subprocess.check_output docs.python.org/library/subprocess.html#module-subprocess — avasal
– avasal, Commented Sep 25, 2012 at 8:41
Why does nobody read the documentation for os.popen? It says: "Deprecated since version 2.6: This function is obsolete. Use the subprocess module." — Matthias
– Matthias, Commented Sep 25, 2012 at 8:48

glglgl · Accepted Answer · 2014-04-04 17:22:32Z

6

import subprocess
sp = subprocess.Popen(["java", "-version"], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
print sp.communicate()
print sp.wait()

is the real way to go.

An even simpler way could be

print subprocess.check_output(["java", "-version"], stderr=subprocess.STDOUT)

edited Apr 4, 2014 at 17:22

answered Sep 25, 2012 at 9:05

glglgl

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Comments

Lev Levitsky · Accepted Answer · 2012-09-25 12:41:20Z

2

The difference is that java -version prints to stderr instead of stdout. You can check the stderr of the command using subprocess.Popen (better) or redirect stdout to stderr manually:

java -version 2>&1

edited Sep 25, 2012 at 12:41

answered Sep 25, 2012 at 8:42

Lev Levitsky

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Comments

CrazyCasta · Accepted Answer · 2012-09-25 08:41:59Z

-2

Yes, the difference is that java -version goes to the stderr stream. Try popen3 http://docs.python.org/library/popen2.html

answered Sep 25, 2012 at 8:41

CrazyCasta

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3 Comments

Matthias Over a year ago

"Deprecated since version 2.6: This module is obsolete. Use the subprocess module."

CrazyCasta Over a year ago

So what, it's still commonly used. Lots of ppl use os.popen and I doubt it's going away in the 2.x branch (which is pretty much dead by now anyway).

Matthias Over a year ago

If something is deprecated I wouldn't recommend it.

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