how to read the value returned by sys.exit() and store it in a variable

Question

I have a python script with sys.exit(0) or sys.exit(-1) in the end (0 or 1 depending on whether an error has occurred). How do I store this 0 or 1 in a variable? For example, in an environment variable or in a variable used by a perl script

Answer 1

If you run your python code in a normal shell you have the $? variable:

   $ python yourscript.py
   $ echo $?  # this will echo the sys.exit value

This is also valid inside your perl script:

 system("python yourscript.py");

 if ($? == -1) {
        print "failed to execute: $!\n";
    }
    elsif ($? & 127) {
        printf "child died with signal %d, %s coredump\n",
        ($? & 127),  ($? & 128) ? 'with' : 'without';
    }
    else {
        printf "child exited with value %d\n", $? >> 8;
    }