473,225 Members | 1,401 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,225 software developers and data experts.

Trying to understand logging.Filter

I'd expect the program below to put only one line with "Eat me" in the log
file. However, I get this with Python 2.4.2 in WingIDE on Windows XP:

Eat me
Ignore me

My understanding is:
1. Event "Ignore me" is logged to logger 'spam'.
2. Logger 'spam' has no handler associated with it, so this logger doesn't
do anything with the event.
3. The event is dispatched to the root logger as well, since this is an
ancestor of 'spam'. This works as expected, since the event "Eat me" is
logged by the root logger.
4. The root logger has a Filter, which requires the logger of the event to
be 'ham', or offspring thereof. 'spam' is not offspring of 'ham' in the
dotted name hierarchy, so the event should be ignored.

So why does "Ignore me" end up in the logfile? What am I missing?

import logging

rootLogger = logging.getLogger()
rootLogger.addHandler(logging.FileHandler(r'C:\Scr atch\SiteChecker\Sitechecker.log'))
rootLogger.addFilter(logging.Filter('ham'))
rootLogger.setLevel(logging.DEBUG)

logging.getLogger('ham.eggs').info("Eat me")
logging.getLogger('spam').info("Ignore me")
logging.getLogger().info("Ignore me too")

logging.shutdown()

--
René Pijlman

Wat wil jij worden? http://www.carrieretijger.nl
Jan 25 '06 #1
1 3065
Rene Pijlman:
3. The event is dispatched to the root logger as well,


Got it. The event is not dispatched to ancestor loggers, but to the
handlers associated with ancestor loggers (Doc: "In addition to any
handlers directly associated with a logger, all handlers associated with
all ancestors of the logger are called to dispatch the message.").

Filters of ancester loggers are not applied, therefore, but filters of
handlers of ancestor loggers are. When I add the filter to the handler
rather than the logger, it works as expected:

import logging

rootLogger = logging.getLogger()
handler = logging.FileHandler(r'C:\Scratch\SiteChecker\Sitec hecker.log')
handler.addFilter(logging.Filter('ham'))
rootLogger.addHandler(handler)
rootLogger.setLevel(logging.DEBUG)

logging.getLogger('ham.eggs').info("Eat me")
logging.getLogger('spam').info("Ignore me")
logging.getLogger().info("Ignore me too")

logging.shutdown()

--
René Pijlman

Wat wil jij worden? http://www.carrieretijger.nl
Jan 25 '06 #2

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

1
by: jeffgeorge | last post by:
Hi all. Trying to move Filter By Selection, Filter By Form, and Apply/Remove Filter directly into my form. No luck. Is there anyway to move them into the header of the form or, as another...
2
by: chuck | last post by:
I want to create two different loggers so that users see one output (e.g. no exception/stack traces) and others (e.g support staff) that does see stack traces via email. The code below is close...
1
by: fuzzylollipop | last post by:
I want a FileHandler to only log a single level say for example logging.INFO, and nothing else. do I need to create a custom Handler for this or is this doable with some magic that is not...
3
by: skosmicki | last post by:
I need to create an function similar to the "MATCH" function in Excel that evaluates a number within a set of numbers and returns whether there is a match. I have put the example of what I see in...
0
by: robert | last post by:
As more and more python packages are starting to use the bloomy (Java-ish) 'logging' module in a mood of responsibility and as I am not overly happy with the current "thickener" style of usage, I...
5
by: Ritesh Raj Sarraf | last post by:
import os, sys, logging logger = logging.getLogger("my_app") conerr = logging.StreamHandler(sys.stderr) conerr.setLevel(logging.DEBUG) conerr_formatter = logging.Formatter('%(levelname)s...
3
by: Gary Jefferson | last post by:
I've written a logging.filter and would like to use doctest on it (using a StreamHandler for stdout), but this doesn't seem possible. Output from the logger seems to disappear (running the doctest...
12
by: Eric S. Johansson | last post by:
I need to to be able to conditionally log based on the method the log statement is in and one other factor like a log level. in order to do so, I need to be able to automatically find out the name...
0
by: maxpirate | last post by:
I am trying to show list data from sub webs on the site collection. But when i try to set filter criteria some comparators like less than, greater than, less than or equal to and greater than or...
1
isladogs
by: isladogs | last post by:
The next online meeting of the Access Europe User Group will be on Wednesday 6 Dec 2023 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, Mike...
0
by: veera ravala | last post by:
ServiceNow is a powerful cloud-based platform that offers a wide range of services to help organizations manage their workflows, operations, and IT services more efficiently. At its core, ServiceNow...
3
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 3 Jan 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). For other local times, please check World Time Buddy In...
0
by: jianzs | last post by:
Introduction Cloud-native applications are conventionally identified as those designed and nurtured on cloud infrastructure. Such applications, rooted in cloud technologies, skillfully benefit from...
2
by: jimatqsi | last post by:
The boss wants the word "CONFIDENTIAL" overlaying certain reports. He wants it large, slanted across the page, on every page, very light gray, outlined letters, not block letters. I thought Word Art...
0
by: fareedcanada | last post by:
Hello I am trying to split number on their count. suppose i have 121314151617 (12cnt) then number should be split like 12,13,14,15,16,17 and if 11314151617 (11cnt) then should be split like...
0
by: stefan129 | last post by:
Hey forum members, I'm exploring options for SSL certificates for multiple domains. Has anyone had experience with multi-domain SSL certificates? Any recommendations on reliable providers or specific...
1
by: davi5007 | last post by:
Hi, Basically, I am trying to automate a field named TraceabilityNo into a web page from an access form. I've got the serial held in the variable strSearchString. How can I get this into the...
0
by: MeoLessi9 | last post by:
I have VirtualBox installed on Windows 11 and now I would like to install Kali on a virtual machine. However, on the official website, I see two options: "Installer images" and "Virtual machines"....

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.