By default, logging functionality follows the default Python logging behavior. If logging functionality is not configured, only events with a severity level of WARNING and greater are printed to sys.stderr. For related information, see Python's Configuring Logging for a Library documentation.

Outputting additional levels requires configuration. For example, to output debug events to sys.stderr set logging.DEBUG and add the logging.StreamHandler handler. Additional handles can also be added, such as logging.FileHandler. This example sets both:

# Classic Protocol Example
import logging
import mysql.connector

logger = logging.getLogger("mysql.connector")
logger.setLevel(logging.DEBUG)

formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s- %(message)s")

stream_handler = logging.StreamHandler()
stream_handler.setFormatter(formatter)
logger.addHandler(stream_handler)

file_handler = logging.FileHandler("cpy.log")
file_handler.setFormatter(formatter)
logger.addHandler(file_handler) 

# XDevAPI Protocol Example
import logging
import mysqlx

logger = logging.getLogger("mysqlx")
logger.setLevel(logging.DEBUG)

formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s- %(message)s")

stream_handler = logging.StreamHandler()
stream_handler.setFormatter(formatter)
logger.addHandler(stream_handler)

file_handler = logging.FileHandler("cpy.log")
file_handler.setFormatter(formatter)
logger.addHandler(file_handler)