Logger with custom formatter

custom_formatter_logger.py

import logging

logger = logging.getLogger("testLogger")
logger.setLevel(logging.DEBUG)
handler = logging.StreamHandler()
handler.setLevel(logging.DEBUG)

class CustomFormatter(logging.Formatter):
    def format(self, record):
        original_log_message = super().format(record)
        
        key_value_pairs = " ".join(
            "{}={}".format(key, value) for key, value in record.my_extras.items()
        )
        
        return original_log_message + " " + key_value_pairs

    
formatter = CustomFormatter()
handler.setFormatter(formatter)
logger.addHandler(handler)

logger.debug("Test log message", extra={"my_extras": {"key1": "value1", "key2": "value2"}})