code: def configure_logger(level):
      
      class _Formatter(logging.Formatter):
          def format(self, record):
              record.levelname = record.levelname[:4]
              return super(_Formatter, self).format(record)
  
      # create stream handler with custom formatter
      stream_handler = logging.StreamHandler()
      stream_handler.setFormatter(_Formatter("[%(levelname)s] %(message)s"))
  
      # configure root logger
      logger = logging.getLogger()
      logger.addHandler(stream_handler)
      logger.setLevel(level)
  
      # capture warnings issued by 'warnings' module
      logging.captureWarnings(True)
docs: Configure a root logger to print records in pretty format.
  
      The format is more readable for end users, since it's not necessary at
      all to know a record's dateime and a source of the record.
  
      Examples::
  
          [INFO] message
          [WARN] message
          [ERRO] message
  
      :param level: a minimum logging level to be printed