I am a python3 beginner. I am trying to get the java version with a python3 script. After I checked the docs, I saw that subprocess.check_output might be what I need.
output = subprocess.check_output(["java", "-version"]) print("Output is {}".format(output)) The problem is the output I am getting is
Output is b'' Why am I not getting the correct string that I get with bash?
Thanks
For some reason your output lands in the stderr. You can pipe that to the return value like this:
output = subprocess.check_output(["java", "-version"], stderr=subprocess.STDOUT) If somebody knows why it goes to stderr, I'd be happy to hear it. ["python", "--version"], for example, works as expected.
java -version command prints to stderr on my system. man java doesn't specify where the output should go. Your code covers both stdout/stderr therefore unless java -version prints directly to terminal; it should work.