TypeError not caught by except statement

[siddhartha veedaluru]

Hi,

except not able to caught the TypeError exception occured in the below
code

       log.info("refer",ret) in the try block

throws a TypeError which is not caught .
Also sometimes process is getting hanged.

------------------------------------------------------------------------------------------------------------------------------------------------
import logging
log = logging.getLogger()
fileName = strftime("%d-%b-%Y-", gmtime()) + str(int(time.time())) + "-
Log.log"
log = logging.getLogger()
log.setLevel(logging.NOTSET)
fh = logging.FileHandler(logFile)
logFileLevel = logging.DEBUG
fh.setLevel(logFileLevel)
format_string = '%(process)d %(thread)d %(asctime)-15s %(levelname)-5s
at %(filename)-15s in %(funcName)-10s at line %(lineno)-3d "%(message)
s"'
fh.setFormatter(logging.Formatter(format_string))
log.addHandler(fh)

try:
   log.info("start")
   log.info("refer",ret)
   log.info("end")
except TypeError:
   log.exception("Exception raised")

----------------------------------------------------------------------------------------------------------------------------------------------
OUTPUT message:

Traceback (most recent call last):
 File "C:\Python26\lib\logging\__init__.py", line 768, in emit
   msg = self.format(record)
 File "C:\Python26\lib\logging\__init__.py", line 648, in format
   return fmt.format(record)
 File "C:\Python26\lib\logging\__init__.py", line 436, in format
   record.message = record.getMessage()
 File "C:\Python26\lib\logging\__init__.py", line 306, in getMessage
   msg = msg % self.args
TypeError: not all arguments converted during string formatting
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