Trace an error in logging.xxx()

gistfile1.py

import logging.handlers

def emit(self, record):
    """
    Emit a record.
    Output the record to the file, catering for rollover as described
    in doRollover().
    """
    try:
        if self.shouldRollover(record):
            self.doRollover()
        logging.FileHandler.emit(self, record)
    except (KeyboardInterrupt, SystemExit):
        raise
    except:
        import pdb; pdb.set_trace()
        self.handleError(record)

logging.handlers.BaseRotatingHandler.emit = emit