code: def formatter(formatter, update_custom_handlers=False):
      
      for handler in list(logger.handlers):
          if hasattr(handler, LOGZERO_INTERNAL_LOGGER_ATTR) or update_custom_handlers:
              handler.setFormatter(formatter)
  
      global _formatter
      _formatter = formatter
docs: Set the formatter for all handlers of the default logger (``logzero.logger``).
  
      This reconfigures only the logzero internal handlers by default, but you can also
      reconfigure custom handlers by using ``update_custom_handlers=True``.
  
      Beware that setting a formatter which uses colors also may write the color codes
      to logfiles.
  
      :arg Formatter formatter: `Python logging Formatter object <https://docs.python.org/2/library/logging.html#formatter-objects>`_ (by default uses the internal LogFormatter).
      :arg bool update_custom_handlers: If you added custom handlers to this logger and want this to update them too, you need to set ``update_custom_handlers`` to `True`