Add information to every log message in Python logging

Question

I am using Python with logging module and would like to add the socket.hostname() to every log message, I have to run this query every message and can not use

Answer 1

You can use filter to add information to every message :

import logging
import socket

class ContextFilter(logging.Filter):
    def filter(self, record):
        record.hostname = socket.gethostname() 
        return True

if __name__ == '__main__':
    levels = (logging.DEBUG, logging.INFO, logging.WARNING, logging.ERROR, logging.CRITICAL)
    logging.basicConfig(level=logging.DEBUG,
                        format='%(asctime)-15s hostname: %(hostname)-15s : %(message)s')
    a1 = logging.getLogger('a.b.c')
    f = ContextFilter()
    a1.addFilter(f)
    a1.debug('A debug message')