Python Logging: Auditing and Debugging Through

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! 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 logging API Configuring Using fileConfig() Configuring Using dictConfig() Wrapping Up 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