structlog 23.1.0

Structured Logging for Python

structlog is the production-ready logging solution for Python:

• Simple: At its core, everything is about functions that take and return dictionaries – all hidden behind familiar APIs.
• Powerful: Functions and dictionaries aren’t just simple, they’re also powerful. structlog leaves you in control.
• Fast: structlog is not hamstrung by designs of yore. Its flexibility comes not at the price of performance.

Thanks to its flexible design, you choose whether you want structlog to take care of the output of your log entries or whether you prefer to forward them to an existing logging system like the standard library's logging module.

The output format is just as flexible and structlog comes with support for JSON, logfmt, as well as pretty console output out-of-the-box:

Sponsors

structlog would not be possible without our amazing sponsors. Especially those generously supporting us at the The Organization tier and higher:

Please consider joining them to help make structlog’s maintenance more sustainable!

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structlog has been successfully used in production at every scale since 2013, while embracing cutting-edge technologies like asyncio, context variables, or type hints as they emerged. Its paradigms proved influential enough to help design structured logging packages across ecosystems.

Project Information

• License: dual Apache License, version 2 and MIT
• Get Help: please use the structlog tag on Stack Overflow
• Supported Python Versions: 3.7 and later
• PyPI
• Source Code
• Documentation
• Changelog
• Third-party Extensions

structlog for Enterprise

Available as part of the Tidelift Subscription.

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Release Information

Added

• structlog.stdlib.BoundLogger now has, analogously to our native logger, a full set of async log methods prefixed with an a: await log.ainfo("event!") #502

• The default configuration now respects the presence of FORCE_COLOR (regardless of its value, unless an empty string). This disables all heuristics whether it makes sense to use colors. #503

• The default configuration now respects the presence of NO_COLOR (regardless of its value, unless an empty string). This disables all heuristics whether it makes sense to use colors and overrides FORCE_COLOR. #504

Fixed

• ConsoleRenderer now reuses the _figure_out_exc_info to process the exc_info argument like ExceptionRenderer does. This prevents crashes if the actual Exception is passed for the exc_info argument instead of a tuple or True. #482

• FilteringBoundLogger.aexception() now extracts the exception info using sys.exc_info() before passing control to the asyncio executor (where original exception info is no longer available). #488

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Full changelog

Credits

structlog is written and maintained by Hynek Schlawack. The idea of bound loggers is inspired by previous work by Jean-Paul Calderone and David Reid.

The development is kindly supported by my employer Variomedia AG, structlog’s Tidelift subscribers, and all my amazing GitHub Sponsors.

A full list of contributors can be found in GitHub’s overview.

The logs-loving futuristic beaver logo has been contributed by Russell Keith-Magee.