python logging code code example
Example 1: python logging to file
import logging
import sys
logger = logging.getLogger()
logger.setLevel(logging.INFO)
formatter = logging.Formatter('%(asctime)s | %(levelname)s | %(message)s',
'%m-%d-%Y %H:%M:%S')
stdout_handler = logging.StreamHandler(sys.stdout)
stdout_handler.setLevel(logging.DEBUG)
stdout_handler.setFormatter(formatter)
file_handler = logging.FileHandler('logs.log')
file_handler.setLevel(logging.DEBUG)
file_handler.setFormatter(formatter)
logger.addHandler(file_handler)
logger.addHandler(stdout_handler)
Example 2: from logging import logger
import logging
logger = logging.getLogger(__name__)
logging.basicConfig(level=logging.DEBUG)
logger.debug('Loging %s lewel', 'DEBUG')
logger.info('Loging %s lewel', 'INFO')
logger.warning('Loging %s lewel', 'WARN')
logger.error('Loging %s lewel', 'ERROR')
logger.critical('Loging %s lewel', 'CRITICAL')
Example 3: pythong logging logger to string
import logging
try:
from cStringIO import StringIO
except ImportError:
from io import StringIO
class LevelFilter(logging.Filter):
def __init__(self, levels):
self.levels = levels
def filter(self, record):
return record.levelno in self.levels
log_stream = StringIO()
logging.basicConfig(stream=log_stream, level=logging.NOTSET)
logging.getLogger().addFilter(LevelFilter((logging.INFO, logging.WARNING, logging.ERROR)))
logging.info('hello world')
logging.warning('be careful!')
logging.debug("you won't see this")
logging.error('you will see this')
logging.critical('critical is no longer logged!')
print(log_stream.getvalue())