Example of adding a filter to a Logger's Handler. Enables messages at one specifie level only

logging.py

"""
Example of adding a filter to a Logger's Handler.
"""
from logging import getLogger, FileHandler, INFO, ERROR


class LogOneLevel:
   """Enables messages at one specifie level only"""

   def __init__(self, level):
       self.level = level

   def filter(self, log_record):
       return log_record.levelno == self.level

logger = getLogger('logger_demo')

info_handler = FileHandler('info.log')
info_handler.addFilter(LogOneLevel(INFO))  # add filter to handler
logger.addHandler(info_handler)

error_handler = FileHandler('error.log')
error_handler.addFilter(LogOneLevel(ERROR))  # add filter to handler
logger.addHandler(error_handler)

logger.info("info msg")    # written to info.log only
logger.error("error msg")  # written to error.log only