Python Logging
Python Logging
About the Book
What does every new developer do when they are first learning to program? They print out strings to their terminal. It's how we learn! But printing out to the terminal isn't what you do with most professional applications.
In those cases, you log in. Sometimes, you log into multiple locations at once. These logs may serve as an audit trail for compliance purposes or help the engineers debug what went wrong.
Python Logging teaches you how to log in the Python programming language. Python is one of the most popular programming languages in the world. Python comes with a logging module that makes logging easy.
What You'll Learn
In this book, you will learn how about the following:
- Logger objects
- Log levels
- Log handlers
- Formatting your logs
- Log configuration
- Logging decorators
- Rotating logs
- Logging and concurrency
- and more!
About the Author
Table of Contents
- Acknowledgments
- Introduction to Python Logging
- Audience
- About the Author
- Conventions
- Book Source Code
- Reader Feedback
- Errata
- Chapter 1 - An Intro to Logging
- What are logs?
- Why are logs useful?
- print() versus logging
- How to create a simple “Hello World” log
- Wrapping Up
- Chapter 2 - Log Levels
- Available log levels
- Using log levels
- Logging Exceptions
- Wrapping Up
- Chapter 3 - Log Handlers
- Available logging handlers
- Using basicConfig
- Using a logging handler
- Using multiple handlers at once
- Other handler features
- Wrapping Up
- Chapter 4 - Log Formatters
- What is a Logging Formatter?
- LogRecords
- LogRecord Attributes
- Formatting Your Logs
- Formatting the Date and Time
- Using Parameters
- Wrapping Up
- Chapter 5 - Log Configuration
- Configuring Using the
loggingAPI
- Configuring Using
fileConfig()
- Configuring Using
dictConfig()
- Wrapping Up
- Configuring Using the
- Chapter 6 - Log Filters
- Creating a filter
- Applying the Filter to a Logger
- Applying the Filter to a Handler
- Wrapping Up
- Chapter 7 - Logging from Multiple Modules
- Logging Using the Logging API
- Logging Using
dictConfig
- Wrapping Up
- Chapter 8 - Creating a Logging Decorator
- What is a Decorator?
- Creating an Exception Logging Decorator
- Passing a Logger to a Decorator
- Wrapping Up
- Chapter 9 - Rotating Logs
- Rotating Logs Based on File Size
- Timed Rotations
- Rotating Logs Using a Config
- Customization Using the Rotator and Namer
- Wrapping Up
- Chapter 10 - Logs and Concurrency
- Using threading
- Using multiprocessing
- Using Threads and Processes
- Using concurrent.futures
- Asynchronous Logging
- Wrapping Up
- Chapter 11 - Logging with Loguru
- Installation
- Logging Made Simple
- Handlers and Formatting
- Catching Exceptions
- Terminal Logging with Color
- Easy Log Rotation
- Wrapping Up
- Chapter 12 - Logging with Structlog
- Installing structlog
- structlog’s Log Levels
- Log Formatting with structlog
- Updating the Timestamp
- Serializing to JSON
- Logging Exceptions using structlog
- Logging to Disk
- Wrapping Up
- Afterword
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