docs: def get_default_logger():
          """Returns default driver logger.
  
          :return: logger instance
          :rtype: logging.Logger
          """
          handler = logging.StreamHandler()
          handler.setLevel(logging.DEBUG)
          handler.setFormatter(logging.Formatter(
              "[%(levelname)1.1s %(asctime)s %(name)s] %(message)s",
              "%y%m%d %H:%M:%S"))
  
          logger_name = "pydbal"
          if Connection._instance_count > 1:
              logger_name += ":" + str(Connection._instance_count)
          logger = logging.getLogger(logger_name)
          logger.setLevel(logging.DEBUG)
          logger.addHandler(handler)
          return logger