You could use a LoggerAdapter so you don’t have to pass the extra info with every logging call:
import logging
extra = {'app_name':'Super App'}
logger = logging.getLogger(__name__)
syslog = logging.StreamHandler()
formatter = logging.Formatter('%(asctime)s %(app_name)s : %(message)s')
syslog.setFormatter(formatter)
logger.setLevel(logging.INFO)
logger.addHandler(syslog)
logger = logging.LoggerAdapter(logger, extra)
logger.info('The sky is so blue')
logs (something like)
2013-07-09 17:39:33,596 Super App : The sky is so blue
Filters can also be used to add contextual information.
import logging
class AppFilter(logging.Filter):
def filter(self, record):
record.app_name="Super App"
return True
logger = logging.getLogger(__name__)
logger.addFilter(AppFilter())
syslog = logging.StreamHandler()
formatter = logging.Formatter('%(asctime)s %(app_name)s : %(message)s')
syslog.setFormatter(formatter)
logger.setLevel(logging.INFO)
logger.addHandler(syslog)
logger.info('The sky is so blue')
produces a similar log record.