New submission from francois-xavier callewaert <fxcallewa...@gmail.com>:
```
>>> import logging
>>> logging.getLogger().handlers[0].setFormatter(logging.Formatter(fmt='{asctime}
>>> {message}', style='{'))
>>> logging.error("hello")
>>>
>>>
2021-08-11 01:04:54,972 hello
```
Wait. I come from a place where we use '.' as a decimal separator ...
```
>>> logging.getLogger().handlers[0].setFormatter(logging.Formatter(fmt='{asctime}.{msecs:03.0f}
>>> {message}', style='{', datefmt="%Y-%m-%d %H:%M:%S"))
>>>
>>>
>>> logging.error("hello")
>>>
2021-08-11 01:06:27.471 hello
```
All very reasonable. I know my date time formatting and my brace formatting so
I'm good or am I ...
```
>>> import time, math
>>> for i in range(2500): a= (lambda : (time.sleep(0.0004),
>>> (logging.error("Whaaat!") )if math.modf(time.time())[0]>0.9995 else 0))()
...
2021-08-11 01:26:40.1000 Whaaat!
```
You'll hopefully agree that formatting a msecs as 1000 is plain wrong.
Can I get around this ? the best / simplest, I've found is
```
>>> logging.Formatter.default_msec_format = "%s.%03d"
>>> logging.getLogger().handlers[0].setFormatter(logging.Formatter(fmt='{asctime}
>>> {message}', style='{'))
>>> for i in range(2500): a= (lambda : (time.sleep(0.0004), (logging.error("Now
>>> that's ok") )if math.modf(time.time())[0]>0.9995 else 0))()
...
2021-08-11 01:33:46.999 Now that's ok
```
Having to rely / teach /learn about "Old string formatting" in 2021 is not
ideal.
Can you suggest something better ?
or would it be palatable to make a "careful" modification in
logging/__init__.py (see below) ?
replace
```
self.msecs = (ct - int(ct)) * 1000
```
by
```
self.msecs = math.floor((ct - int(ct)) * 1000) #requires importing math
```
or
```
self.msecs = int((ct - int(ct)) * 1000) + 0.0
```
----------
components: Library (Lib)
messages: 399371
nosy: fxcallewaert
priority: normal
severity: normal
status: open
title: logging Formatter behavior when using msecs and braces : '{'
type: behavior
versions: Python 3.11
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44884>
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