code: def add_filehandler(level, fmt, filename, mode, backup_count, limit, when):
      
      kwargs = {}
   
      # If the filename is not set, use the default filename
      if filename is None:
          filename = getattr(sys.modules['__main__'], '__file__', 'log.py')
          filename = os.path.basename(filename.replace('.py', '.log'))
          filename = os.path.join('/tmp', filename)
  
      if not os.path.exists(os.path.dirname(filename)):
          os.mkdir(os.path.dirname(filename))
  
      kwargs['filename'] = filename
   
      # Choose the filehandler based on the passed arguments
      if backup_count == 0:  # Use FileHandler
          cls = logging.FileHandler
          kwargs['mode'] = mode
      elif when is None:  # Use RotatingFileHandler
          cls = logging.handlers.RotatingFileHandler
          kwargs['maxBytes'] = limit
          kwargs['backupCount'] = backup_count
          kwargs['mode'] = mode
      else:  # Use TimedRotatingFileHandler
          cls = logging.handlers.TimedRotatingFileHandler
          kwargs['when'] = when
          kwargs['interval'] = limit
          kwargs['backupCount'] = backup_count
   
      return add_handler(cls, level, fmt, False, **kwargs)
docs: Add a file handler to the global logger.