Versions are year-based with a strict backward compatibility policy. The third digit is only for regressions.
The main features of this release are massive improvements in standard library’s
Have a look at the updated standard library chapter on how to use them!
Special thanks go to
that made them possible.
- The default renderer now is
structlog.dev.ConsoleRendererif you don’t configure
structlog. Colors are used if available and human-friendly timestamps are prepended. This is in line with our backward compatibility policy that explicitly excludes default settings.
structlog.stdlib.render_to_log_kwargs(). This allows you to use
logging-based formatters to take care of rendering your entries. #98
structlog.stdlib.ProcessorFormatterwhich does the opposite: This allows you to run
structlogprocessors on arbitrary
logging.LogRecords. #79 #105
- UNIX epoch timestamps from
structlog.processors.TimeStamperare more precise now.
- Added repr_native_str to
structlog.dev.ConsoleRenderer. This allows for human-readable non-ASCII output on Python 2 (
repr()on Python 2 haves like
ascii()on Python 3 in that regard). As per compatibility policy, it’s on (original behavior) in
KeyValueRendererand off (humand-friendly behavior) in
- Added colors argument to
structlog.dev.ConsoleRendererand made it the default renderer. #78
- Fixed bug with Python 3 and
structlog.stdlib.BoundLogger.log(). Error log level was not reproductible and was logged as exception one time out of two. #92
- Positional arguments are now removed even if they are empty. #82
Python 3.3 and 2.6 aren’t supported anymore. They may work by chance but any effort to keep them working has ceased.
The last Python 2.6 release was on October 29, 2013 and isn’t supported by the CPython core team anymore. Major Python packages like Django and Twisted dropped Python 2.6 a while ago already.
Python 3.3 never had a significant user base and wasn’t part of any distribution’s LTS release.
- Add a
key_orderis used and a key is missing a value, it’s not rendered at all instead of being rendered as
- Exceptions without a
__traceback__are now also rendered on Python 3.
- Don’t cache loggers in lazy proxies returned from
get_logger(). This lead to in-place mutation of them if used before configuration which in turn lead to the problem that configuration was applied only partially to them later. #72
structlog.processors.format_exc_infonow support passing of Exceptions on Python 3.
- Clean up the context when exiting
structlog.threadlocal.tmp_bindin case of exceptions. #64
- Be more more lenient about missing
structlog.dev.ConsoleRendererthat renders the event dictionary aligned and with colors.
- Use six for compatibility.
structlog.processors.UnicodeDecoderthat will decode all byte string values in an event dictionary to Unicode.
structlog.processors.JSONRendererwhich allows for using different (possibly faster) JSON encoders than the standard library.
- Allow empty lists of processors. This is a valid use case since #26 has been merged. Before, supplying an empty list resulted in the defaults being used.
- Prevent Twisted’s
log.errfrom quoting strings rendered by
- Better support of
- Add option to specify target key in
- Pass positional arguments to stdlib wrapped loggers that use string formatting. #19
structlogis now dually licensed under the Apache License, Version 2 and the MIT license. Therefore it is now legal to use structlog with GPLv2-licensed projects. #28
- Fixed a memory leak in greenlet code that emulates thread locals. It shouldn’t matter in practice unless you use multiple wrapped dicts within one program that is rather unlikely. #8
structlog.PrintLoggernow is thread-safe.
- Test Twisted-related code on Python 3 (with some caveats).
- Drop support for Python 3.2. There is no justification to add complexity for a Python version that nobody uses. If you are one of the 0.350% that use Python 3.2, please stick to the 0.4 branch; critical bugs will still be fixed.
- Officially support Python 3.4.
- Allow final processor to return a dictionary. See the adapting chapter. #26
from structlog import *works now (but you still shouldn’t use it).
- Don’t cache proxied methods in
structlog.threadlocal._ThreadLocalDictWrapper. This doesn’t affect regular users.
- Various doc fixes.
structlog.processors.StackInfoRendererfor adding stack information to log entries without involving exceptions. Also added it to default processor chain. #6
- Allow optional positional arguments for
structlog.get_loggerthat are passed to logger factories. The standard library factory uses this for explicit logger naming. #12
structlog.processors.ExceptionPrettyPrinterfor development and testing when multiline log entries aren’t just acceptable but even helpful.
- Allow the standard library name guesser to ignore certain frame names. This is useful together with frameworks.
- Add meta data (e.g. function names, line numbers) extraction for wrapped stdlib loggers. #5
- Greatly enhanced and polished the documentation and added a new theme based on Write The Docs, requests, and Flask.
- Add Python Standard Library-specific BoundLogger that has an explicit API instead of intercepting unknown method calls.
structlog.ReturnLoggernow allows arbitrary positional and keyword arguments.
- Add Twisted-specific BoundLogger that has an explicit API instead of intercepting unknown method calls.
- Allow logger proxies that are returned by
structlog.wrap_loggerto cache the BoundLogger they assemble according to configuration on first use. See the chapter on performance and the
- Extract a common base class for loggers that does nothing except keeping the context state.
This makes writing custom loggers much easier and more straight-forward.
- Promote to stable, thus henceforth a strict backward compatibility policy is put into effect.
structlog.processors.KeyValueRendererfor more predictable log entries with any
structlog.PrintLoggernow uses proper I/O routines and is thus viable not only for examples but also for production.
- Enhance Twisted support by offering JSONification of non-structlog log entries.
- Allow for custom serialization in