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How about if I add a LoggerAdapter class which takes a 
logger in the __init__ and has logging methods debug(), info() 
etc. [and including _log()] which delegate to the underlying 
logger? Then you could subclass the Adapter and just 
override the methods you needed. Would that fit the bill? Of 
course the package can use a Logger-derived class, but this 
would apply to all loggers where the LoggerAdapter could be 
used for just some of the loggers in a system.