How to get the exit status set in a shell script in Python

Question

I want to get the exit status set in a shell script which has been called from Python.

The code is as below

Python script

result = os.system("./compile_cmd.sh")
print result

File compile_cmd.sh

javac @source.txt
# I do some code here to get the number of compilation errors
if [$error1 -e 0 ]
then
echo "\n********** Java compilation successful **********"
exit 0
else
echo "\n** Java compilation error in file ** File not checked in to CVS **"
exit 1
fi

I am running this code, but no matter the what exit status I am returning, I am getting result var as 0 (I think it's returning whether the shell script ran successfully or not).

How can I fetch the exit status that I am setting in the shell script in the Python script?

you can use subprocess and get the returncode, like this: stackoverflow.com/questions/5631624/… — cptPH
– cptPH, Commented Dec 3, 2013 at 9:57

Sourabh · Accepted Answer · 2021-02-01 13:43:17Z

25

import subprocess

result = subprocess.Popen("./compile_cmd.sh")
text = result.communicate()[0]
return_code = result.returncode

Taken from here: How to get exit code when using Python subprocess communicate method?

edited Feb 1, 2021 at 13:43

Sourabh

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answered Dec 3, 2013 at 9:59

cptPH

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Comments

mklement0 · Accepted Answer · 2021-05-21 23:51:41Z

17

To complement cptPH's helpful answer with the recommended Python v3.5+ approach using subprocess.run():

import subprocess

# Invoke the shell script (without up-front shell involvement)
# and pass its output streams through.
# run()'s return value is an object with information about the completed process. 
completedProc = subprocess.run('./compile_cmd.sh')

# Print the exit code.
print(completedProc.returncode)

edited May 21, 2021 at 23:51

answered Apr 9, 2019 at 20:55

mklement0

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Comments

Rajat Tyagi · Accepted Answer · 2021-01-17 08:30:50Z

import subprocess
proc = subprocess.Popen("Main.exe",stdout=subprocess.PIPE,creationflags=subprocess.DETACHED_PROCESS)
result,err = proc.communicate()
exit_code = proc.wait()
print(exit_code)
print(result,err)

In subprocess.Popen -> creation flag is used for creating the process in detached mode if you don't wnat in detached more just remove that part.
subprocess.DETACHED_PROCESS -> run the process outside of the python process

with proc.communicate() -> you can get he output and the errors from that process proc.wait() will wait for the process to finish and gives the exit code of the program.

Note: any commands between subprocess.popen() and proc.wait() will execute as usual at the wait call it will not execute further before the subprocess is finished.

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