code: def set_file_logger(filename: str, name: str = 'parsl', level: int = logging.DEBUG, format_string: Optional[str] = None):
      
      if format_string is None:
          format_string = "%(asctime)s.%(msecs)03d %(name)s:%(lineno)d [%(levelname)s]  %(message)s"
  
      logger = logging.getLogger(name)
      logger.setLevel(logging.DEBUG)
      handler = logging.FileHandler(filename)
      handler.setLevel(level)
      formatter = logging.Formatter(format_string, datefmt='%Y-%m-%d %H:%M:%S')
      handler.setFormatter(formatter)
      logger.addHandler(handler)
  
      # see note in set_stream_logger for notes about logging
      # concurrent.futures
      futures_logger = logging.getLogger("concurrent.futures")
      futures_logger.addHandler(handler)
docs: Add a stream log handler.
  
      Args:
          - filename (string): Name of the file to write logs to
          - name (string): Logger name
          - level (logging.LEVEL): Set the logging level.
          - format_string (string): Set the format string
  
      Returns:
         -  None