Error when calling a python script from expect script -

i have python script called mypython.py has logger module imported. mypython.py called expect script called myexpect.exp. issue when add logger.info('test') statement in mypython.py , call myexpect.exp myexpect.exp fails. if replace logger.log('test') statement print statement working fine.

content of python script

import os import sys import datetime import time import argparse import logging  logging.basicconfig(format="%(asctime)s %(message)s",                 datefmt='%m/%d/%y %i:%m:%s %p',                 level=logging.info) logger = logging.getlogger(__name__)  *** *** def main():     args = get_args()      print 'this print statement ' + args.test_arg ### ok     logger.info("this logger statement" + " " + args.test_arg) ### has issue 

content of expect script

#!/usr/bin/expect --  #exec python mypath/stratus/bin/mypython.py "test" ">@stdout" exec python prnt_stmt.py -t arg_from_exp ">@stdout" 

error got

this print statement arg_from_exp 03/06/2014 03:16:55 logger statement arg_from_exp     while executing "exec python mypython.py -t arg_from_exp ">@stdout""     (file "./myexpect.exp" line 9) 

can me out in this?

tcl's exec command bit weird. throw error if

1. the exec'ed command returns non-zero exit status, or
2. the exec'ed command writes stderr.

see "child status" section of http://wiki.tcl.tk/exec

you might do:

set status [catch {exec -ignorestderr python mypython.py -t arg_from_exp} output] if {$status == 0} {     puts "no problem" } else {     puts "non-zero exit status" }