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bad logging documentation {}-formatting placeholder #109451
Description
Documentation
%-formatting (It works)
import logging
logging.basicConfig(filename='example.log', format='%(msecs)03d - %(message)s')
logging.warning('foo')example.log:
273 - foo
✅
Now using the the modern {} format syntax, as the documentation says (doesn't work)
import logging
logging.basicConfig(filename='example.log', format='{msecs:03d} - {message}', style='{')
logging.warning('foo')❌
Exception:
--- Logging error ---
Traceback (most recent call last):
File "...\Python\Python310\lib\logging\__init__.py", line 1100, in emit
msg = self.format(record)
File "...\Python\Python310\lib\logging\__init__.py", line 943, in format
return fmt.format(record)
File "...\Python\Python310\lib\logging\__init__.py", line 681, in format
s = self.formatMessage(record)
File "...\Python\Python310\lib\logging\__init__.py", line 650, in formatMessage
return self._style.format(record)
File "...\Python\Python310\lib\logging\__init__.py", line 440, in format
return self._format(record)
File "...\Python\Python310\lib\logging\__init__.py", line 458, in _format
return self._fmt.format(**values)
ValueError: Unknown format code 'd' for object of type 'float'
Call stack:
File "...\main.py", line 26, in <module>
logging.warning('foo')
Message: 'foo'
Arguments: ()Proposed fix
Use {msecs:03.0f} placeholder.
import logging
logging.basicConfig(filename='example.log', format='{msecs:03.0f} - {message}', style='{')
logging.warning('foo')example.log:
273 - foo
✅
Activity
sobolevn commentedon Sep 15, 2023
Please, send a PR :)
Fix logging documentation (python#109451)
gh-109451: Fix wrong format specifier in logging documentation (GH-10…
pythongh-109451: Fix wrong format specifier in logging documentation (p…
pythongh-109451: Fix wrong format specifier in logging documentation (p…
[3.11] gh-109451: Fix wrong format specifier in logging documentation (…
[3.12] gh-109451: Fix wrong format specifier in logging documentation (…
pythongh-109451: Fix wrong format specifier in logging documentation (p…