Simple Way of Tagging Log Messages

Do this:
logging.info("TagName: FooBar")
and you message will be tagged! You just need to start all your messages with "TagName: ". And this is of course not very elegant.

Better Solution

Setup your logger:

log = logging.getLogger('name')
address=('log-server',logging.handlers.SYSLOG_UDP_PORT)
facility=logging.handlers.SysLogHandler.LOG_USER
h=logging.handlers.SysLogHandler( address,facility )
f = logging.Formatter('TagName: %(message)s')
h.setFormatter(f)
log.addHandler(h)

And use it:

log.info('FooBar')

I’m adding this just for the sake of completion, even though @sasha’s answer is absolutely correct.

If you happen to log messages to syslog directly using syslog.syslog, you can set the tag using the syslog.openlog function:

import syslog
syslog.openlog('foo')
syslog.syslog('bar')

Going back to the linux shell:

$ tail -f /var/log/syslog
Sep  7 07:01:58 dev-balthazar foo: bar