Logging is an essential part of a professional application. Logging is required by law for some kinds of applications, such as financial and medical applications.
Presentation Introduction to Logging
Logging in Python
Python Logging Howto basic & advanced tutorials (not really advanced).
Logging in Python on RealPython.com
Logging Practice
Logging Practice exercise
Logging in Django
Django extends the Python logging module.
You can configure logging in your Django settings.py file.
You can also configure logging for a specific “app” in the app.py file,
which is described in the second article below.
But it’s usually better to configure logging in settings.py.
Logging configuration done in app.py or any other file may
go unnoticed when you try to modify logging at a later time.
- Django Logging, The Right Way clear explanation with examples
- Disabling Error Emails in Django explains how to remove default loggers in Django
- Logging in the official Django docs
Configure Python Logging in Code
This function contains examples of configuring Python logging in code, using a FileHandler, Formatter, and StreamHandler.
For simple logging configuration, it much easier to use basicConfig
instead of this.
def configure():
"""Configure loggers and log handlers."""
# write all messages to a file.
# For a real app, use a configurable absolute path to log file.
filehandler = logging.FileHandler("demo.log")
filehandler.setLevel(logging.DEBUG)
formatter = logging.Formatter('%(asctime)s %(name)s %(levelname)s: %(message)s')
filehandler.setFormatter(formatter)
# add the handler to the root logger, it will handle all log msgs
root = logging.getLogger()
root.setLevel(logging.NOTSET)
root.addHandler(filehandler)
# Define a console handler for messages of level WARNING or higher
console_handler = logging.StreamHandler()
console_handler.setLevel(logging.WARNING)
formatter = logging.Formatter(fmt="%(levelname)-8s %(name)s: %(message)s")
console_handler.setFormatter(formatter)
root.addHandler(console_handler)
Logging Services
You can use a logging service to receive, monitor, analyze, and store logs.
Commercial web sites can generate hundreds of megabytes (or more!) of log info every day. Those logs need to be filtered, scanned for suspicious activity or error messages, and summarized. Logging services do this.
Logging Services also aggregate logs from many machines or many apps. A busy web service may have several hosts running the same application to provide faster responses. A logging service will combine logs from many hosts.
Some logging services are: