[issue21912] Deferred logging may use outdated references

[Jonas Diemer]

Jonas Diemer added the comment:

I see your point. 

The decision whether to log or not is actually made synchronously to the actual logging call, as far as I can tell (i.e. "if self.isEnabledFor..." is checked directly in debug()). So at this place, the formatting could already happen.
I don't see a reason to defer the formatting to the actual output of the messages (other than the current implementation of logging).

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<http://bugs.python.org/issue21912>
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