Logging ancestors ignored if config changes?

andrew cooke andrew at acooke.org
Fri Apr 25 23:02:21 EDT 2008


I am seeing some odd behaviour with logging which would be explained
if loggers that are not defined explicitly (but which are controlled
via their ancestors) must be created after the logging system is
configured via fileConfig().

That's a bit abstract, so here's the problem itself:  I define my log
within a module by doing

import logging
log = logging.getLogger(__name__)

Now typically __name__ will be something like "acooke.utils.foo".

That happens before the application configures logging, which it does
by calling logging.config.fileConfig() to load a configuration.

If I do that, then I don't see any logging output from
"acooke.utils.foo" (when using "log" from above after "fileConfig" has
been called) unless I explicitly define a logger with that name.
Neither root nor an "acooke" logger, defined in the config file, are

Is this a bug?  Am I doing something stupid?  To me the above seems
like a natural way of using the system...


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