New submission from Роман Донченко <d...@corrigendum.ru>:
Consider this code:
```
import logging
class MyLogRecord(logging.LogRecord):
def getMessage(self):
print("Help! I am being formatted!")
return super().getMessage()
logging.setLogRecordFactory(MyLogRecord)
logger = logging.getLogger("test")
logger.addHandler(logging.StreamHandler())
logger.addHandler(logging.StreamHandler())
logger.error("%d", 123)
```
Its output is:
```
Help! I am being formatted!
123
Help! I am being formatted!
123
```
In other words, the record's `getMessage` method is called once for every
handler. That seems quite unnecessary, especially since the formatted message
is saved in the `message` field of the record by `Formatter.format`.
`Formatter` could check whether the message has already been formatted, and if
so, use the saved message.
----------
components: Library (Lib)
messages: 403879
nosy: SpecLad
priority: normal
severity: normal
status: open
title: logging messages are needlessly reformatted for every handler
type: enhancement
versions: Python 3.10
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45465>
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