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Structured Logging for Python

Project description

structlog mascot

structlog is the production-ready logging solution for Python:

  • Simple: Everything is about functions that take and return dictionaries – all hidden behind familiar APIs.
  • Powerful: Functions and dictionaries aren’t just simple but 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:

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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!


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.

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structlog for Enterprise

Available as part of the Tidelift Subscription.

The maintainers of structlog and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source packages you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact packages you use. Learn more.

Release Information

Fixed

  • The lazy logger proxy returned by structlog.get_logger() now returns its initial values when asked for context. When asked for context before binding for the first time, it returned an empty dictionary in 23.3.0.

  • The displayed level name when using structlog.stdlib.BoundLogger.exception() is "error" instead of "exception". Fixes regression in 23.3.0. #584

  • Don't ignore the width argument of RichTracebackFormatter. #587


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.

The logs-loving beaver logo has been contributed by Lynn Root.

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