How to use the logzero.__init__.LogFormatter function in logzero

# Reconfigure existing handlers
    stderr_stream_handler = None
    for handler in list(_logger.handlers):
        if hasattr(handler, LOGZERO_INTERNAL_LOGGER_ATTR):
            if isinstance(handler, logging.FileHandler):
                # Internal FileHandler needs to be removed and re-setup to be able
                # to set a new logfile.
                _logger.removeHandler(handler)
                continue
            elif isinstance(handler, logging.StreamHandler):
                stderr_stream_handler = handler

        # reconfigure handler
        handler.setLevel(level)
        handler.setFormatter(formatter or LogFormatter())

    # remove the stderr handler (stream_handler) if disabled
    if disableStderrLogger:
        if stderr_stream_handler is not None:
            _logger.removeHandler(stderr_stream_handler)
    elif stderr_stream_handler is None:
        stderr_stream_handler = logging.StreamHandler()
        setattr(stderr_stream_handler, LOGZERO_INTERNAL_LOGGER_ATTR, True)
        stderr_stream_handler.setLevel(level)
        stderr_stream_handler.setFormatter(formatter or LogFormatter())
        _logger.addHandler(stderr_stream_handler)

    if logfile:
        rotating_filehandler = RotatingFileHandler(filename=logfile, maxBytes=maxBytes, backupCount=backupCount)
        setattr(rotating_filehandler, LOGZERO_INTERNAL_LOGGER_ATTR, True)
        rotating_filehandler.setLevel(fileLoglevel or level)

logger.removeHandler(handler)
            elif isinstance(handler, logging.StreamHandler) and disableStderrLogger:
                logger.removeHandler(handler)

    # Step 2: If wanted, add the RotatingFileHandler now
    if filename:
        rotating_filehandler = RotatingFileHandler(filename, mode=mode, maxBytes=maxBytes, backupCount=backupCount, encoding=encoding)

        # Set internal attributes on this handler
        setattr(rotating_filehandler, LOGZERO_INTERNAL_LOGGER_ATTR, True)
        if loglevel:
            setattr(rotating_filehandler, LOGZERO_INTERNAL_HANDLER_IS_CUSTOM_LOGLEVEL, True)

        # Configure the handler and add it to the logger
        rotating_filehandler.setLevel(loglevel or _loglevel)
        rotating_filehandler.setFormatter(formatter or _formatter or LogFormatter(color=False))
        logger.addHandler(rotating_filehandler)

# remove the stderr handler (stream_handler) if disabled
    if disableStderrLogger:
        if stderr_stream_handler is not None:
            _logger.removeHandler(stderr_stream_handler)
    elif stderr_stream_handler is None:
        stderr_stream_handler = logging.StreamHandler()
        setattr(stderr_stream_handler, LOGZERO_INTERNAL_LOGGER_ATTR, True)
        stderr_stream_handler.setLevel(level)
        stderr_stream_handler.setFormatter(formatter or LogFormatter())
        _logger.addHandler(stderr_stream_handler)

    if logfile:
        rotating_filehandler = RotatingFileHandler(filename=logfile, maxBytes=maxBytes, backupCount=backupCount)
        setattr(rotating_filehandler, LOGZERO_INTERNAL_LOGGER_ATTR, True)
        rotating_filehandler.setLevel(fileLoglevel or level)
        rotating_filehandler.setFormatter(formatter or LogFormatter(color=False))
        _logger.addHandler(rotating_filehandler)

    return _logger

elif isinstance(handler, logging.StreamHandler):
                stderr_stream_handler = handler

        # reconfigure handler
        handler.setLevel(level)
        handler.setFormatter(formatter or LogFormatter())

    # remove the stderr handler (stream_handler) if disabled
    if disableStderrLogger:
        if stderr_stream_handler is not None:
            _logger.removeHandler(stderr_stream_handler)
    elif stderr_stream_handler is None:
        stderr_stream_handler = logging.StreamHandler()
        setattr(stderr_stream_handler, LOGZERO_INTERNAL_LOGGER_ATTR, True)
        stderr_stream_handler.setLevel(level)
        stderr_stream_handler.setFormatter(formatter or LogFormatter())
        _logger.addHandler(stderr_stream_handler)

    if logfile:
        rotating_filehandler = RotatingFileHandler(filename=logfile, maxBytes=maxBytes, backupCount=backupCount)
        setattr(rotating_filehandler, LOGZERO_INTERNAL_LOGGER_ATTR, True)
        rotating_filehandler.setLevel(fileLoglevel or level)
        rotating_filehandler.setFormatter(formatter or LogFormatter(color=False))
        _logger.addHandler(rotating_filehandler)

    return _logger