code: def get_logger(name, level=None, fmt=':%(lineno)d: %(message)s'):
          
          if name not in Logger.loggers:
              if Logger.level is None and level is None:
                  Logger.level = level = logging.ERROR
              elif Logger.level is None:
                  Logger.level = level
              elif level is None:
                  level = Logger.level
              logger = logging.getLogger(name)
              logger_handler = logging.StreamHandler()
              logger_handler.setFormatter(LoggingFormatter(fmt=name + fmt))
              logger.addHandler(logger_handler)
              logger.setLevel(level)
              Logger.loggers[name] = logger
          return Logger.loggers[name]
docs: Return a logger.
  
          Args:
              name (str): name to pass to the logging module.
              level (int): level of logging.
              fmt (str): format string.
  
          Returns:
              logging.Logger: logger from ``logging.getLogger``.