Add microseconds to logging.LogRecord #90450

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1. jamescasbon commented on Jan 7, 2022

   

   jamescasbonmannequin

   on Jan 7, 2022

   MannequinAuthor

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   LogRecord makes microseconds available via the msecs attribute. This patch adds microseconds via usecs attribute.

   Some regulators (eg MIFID II) require accuracy greater than 1ms in some industries.

   This patch calls time_ns rather than time so that the usecs and msecs are calculated from int types and then gets the original ct attribute via division.
2. jamescasbon

   added

   stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

   type-featureA feature request or enhancementA feature request or enhancement

   on Jan 7, 2022
3. vsajip

   added

   3.11only security fixesonly security fixes

   on Jan 7, 2022
4. vsajip commented on Jan 7, 2022

   

   vsajip

   on Jan 7, 2022

   Member

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   Thanks for the patch. We're need to get contributors to sign a Contributor License Agreement (CLA) before we can accept their patches. Would you be willing to do this? The process could be smoother, but it's not too bad, and here's where you get started:

   https://www.python.org/psf/contrib/contrib-form/
5. ezio-melotti

   transferred this issue fromon Apr 10, 2022
6. serhiy-storchaka

   added this to Logging issues 🪵on May 20, 2022
7. vsajip

   moved this to CLA not signed in Logging issues 🪵on Aug 26, 2022
8. askoretskiy commented on Jul 5, 2024

   

   askoretskiy

   on Jul 5, 2024

   Last edited by askoretskiy

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   Any progress here? That would be really helpful feature. Had to implement third-party Formatter class to solve this issue.

   Maybe, core team could implement something similar? Or maybe even allow "%f" in the dateFormat?

   import logging
   from datetime import datetime
   
   class CustomFormatter(logging.Formatter):
       def formatTime(self, record, datefmt=None):
           if not datefmt:
               return super().formatTime(record, datefmt=datefmt)
   
           return datetime.fromtimestamp(record.created).astimezone().strftime(datefmt)
   
9. vsajip commented on Jul 5, 2024

   

   vsajip

   on Jul 5, 2024

   Member

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   Patch partly superseded by #102412 and #120709. Will look into this shortly.
10. askoretskiy commented on Feb 2, 2025

    

    askoretskiy

    on Feb 2, 2025

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    Thanks for merging into Python 3.13.

    How fix is shorter:

    class CustomFormatter(logging.Formatter):
        # Workaround until https://github.com/python/cpython/issues/90450 is fixed
        def formatTime(self, record, datefmt=None):
            record.usecs = 100_000 * (record.created % 1)
            return super().formatTime(record, datefmt=datefmt)

    And usage:

    LOGGING = {
        ...,
        "formatters": {
            "verbose": {
                "format": "{asctime},{usecs:06.0f} {levelname:8} {name} {message}",
                "datefmt": "%Y-%m-%d %H:%M:%S",
                "style": "{",
                "class": "CustomFormatter",
            },
    }
11. picnixz

    removed

    3.11only security fixesonly security fixes

    on Feb 2, 2025
12. sayedmasihemami commented on Sep 14, 2026

    

    sayedmasihemami

    on Sep 14, 2026

    Last edited by sayedmasihemami

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    @askoretskiy should the multiplier in your suggested fix not be 1_000_000 instead?