Logging shows wrong linenumber - python-2.7

Question

Im trying to learn python 2.7s logging module, and have copied this clip:
def _logging():
# set up program logging
global logger
# valid logging levels:
# =====================
# logger.debug('debug message')
# logger.info('info message')
# logger.warn('warn message')
# logger.error('error message')
# logger.critical('critical message')
#
# to show traceback:
# logger.critical(str(e), exc_info = True) # if 'error' & 'True' - halts script
logger = logging.getLogger()
logger.setLevel(logging.DEBUG)
# create file handler which logs INFO & above messages
fh = logging.FileHandler('c:/temp/pgmLog.log','w')
fh.setLevel(logging.INFO)
# create console handler that logs all messages
ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)
# create formatter and add it to the handlers
formatter = logging.Formatter('%(asctime)s %(lineno)-5d %(levelname)-12s %(message)s', datefmt='%m-%d-%Y %H:%M:%S')
ch.setFormatter(formatter)
fh.setFormatter(formatter)
# add the handlers to logger
logger.addHandler(ch) # console logger
logger.addHandler(fh) # file logger
when I run the following piece:
logger.info('Program start')
try:
print 3/0
except Exception, err:
logger.error(err)
the logger is showing me:
11-22-2014 15:48:32 46 INFO Program start
11-22-2014 15:48:32 1415 ERROR integer division or modulo by zero
Can someone please tell me why the error is showing as line 1415, and not the real location of the error?
Many thanks