Fixing broken logging after rospy.init_node()

route_logger_to_ros.py

import logging
import rospy


class ConnectPythonLoggingToROS(logging.Handler):

    level_map = {
        logging.DEBUG: rospy.logdebug,
        logging.INFO: rospy.loginfo,
        logging.WARNING: rospy.logwarn,
        logging.ERROR: rospy.logerr,
        logging.CRITICAL: rospy.logfatal
    }

    def emit(self, record):
        try:
            self.level_map[record.levelno]("%s: %s" % (record.name, record.msg))
        except KeyError:
            rospy.logerr("unknown log level %s LOG: %s: %s" % (record.levelno, record.name, record.msg))


def route_logger_to_ros(logger_name):
    '''Re-routes a Python logging.logger to the ROS logging infrastructure.
    Without using this, once `rospy.init_node()` has been called, any use of `logging` occurs silently.

    Example:
        rospy.init_node('my_node')
        route_logger_to_ros('my_custom_library')

        # In an imported library:
        logger = logging.getLogger('my_custom_library)
        logger.info('This message gets routed to ROS logging if a ROS node was initialized in this process.')
    '''
    logging.getLogger(logger_name).addHandler(ConnectPythonLoggingToROS())

how to use these codes with rospy.init_node(),I have the same error,could you help me?

errors :
(venv3.9) ucar@superbrain:~/ucar_ws/src/ucar_camera/src$ rosrun ucar_camera iflydetect（复件）.py
An error occurred: Unknown level: 'DEBUG'
Traceback (most recent call last):
File "/home/ucar/ucar_ws/src/ucar_camera/src/iflydetect（复件）.py", line 229, in
rospy.init_node("cv_bridge_test")
File "/opt/ros/noetic/lib/python3/dist-packages/rospy/client.py", line 309, in init_node
rospy.core.configure_logging(resolved_node_name)
File "/opt/ros/noetic/lib/python3/dist-packages/rospy/core.py", line 405, in configure_logging
_log_filename = rosgraph.roslogging.configure_logging('rospy', level, filename=filename)
File "/opt/ros/noetic/lib/python3/dist-packages/rosgraph/roslogging.py", line 192, in configure_logging
logging.config.fileConfig(config_file, disable_existing_loggers=False)
File "/usr/local/python3.9/lib/python3.9/logging/config.py", line 79, in fileConfig
handlers = _install_handlers(cp, formatters)
File "/usr/local/python3.9/lib/python3.9/logging/config.py", line 149, in _install_handlers
h.setLevel(level)
File "/usr/local/python3.9/lib/python3.9/logging/init.py", line 910, in setLevel
self.level = _checkLevel(level)
File "/usr/local/python3.9/lib/python3.9/logging/init.py", line 194, in _checkLevel
raise ValueError("Unknown level: %r" % level)
ValueError: Unknown level: 'DEBUG'