def makePickle(self, record):
        """
        Use JSON.
        """
        #ei = record.exc_info
        #if ei:
        #    dummy = self.format(record) # just to get traceback text into record.exc_text
        #    record.exc_info = None  # to avoid Unpickleable error
        s = '%s%s:%i:%s\n' % (self.prefix, record.name, int(record.created), self.format(record))
        #if ei:
        #    record.exc_info = ei  # for next handler
        return s
Use JSON.