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

system("python yourscript.py");

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

CMDPROMPT>python
Python 2.7.3 (default, Apr 10 2012, 23:24:47) [MSC v.1500 64 bit (AMD64)] on win 32
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.exit(-1)
CMDPROMPT>echo %ERRORLEVEL%
-1
CMDPROMPT>python
Python 2.7.3 (default, Apr 10 2012, 23:24:47) [MSC v.1500 64 bit (AMD64)]     on win 32
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.exit(0)
CMDPROMPT>echo %ERRORLEVEL%
0
CMDPROMPT>