Vinay Sajip added the comment:

As RDM says, this behaviour is as designed. The logger's setLevel documentation 
says:

"Sets the threshold for this logger to lvl. Logging messages which are less 
severe than lvl will be ignored. When a logger is created, the level is set to 
NOTSET (which causes all messages to be processed when the logger is the root 
logger, or delegation to the parent when the logger is a non-root logger). Note 
that the root logger is created with level WARNING.

The term ‘delegation to the parent’ means that if a logger has a level of 
NOTSET, its chain of ancestor loggers is traversed until either an ancestor 
with a level other than NOTSET is found, or the root is reached.

If an ancestor is found with a level other than NOTSET, then that ancestor’s 
level is treated as the effective level of the logger where the ancestor search 
began, and is used to determine how a logging event is handled.

If the root is reached, and it has a level of NOTSET, then all messages will be 
processed. Otherwise, the root’s level will be used as the effective level."

Not sure how I can improve upon that, as it seems clear enough, but any 
suggestions are welcome.

----------
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30862>
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