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Yes this problem is easily solved by subclassing.  However I 
firmly believe that it is a terrible default behaviour, and that it's 
likely to hit many asyncore users.  A class shouldn't have to 
be subclassed to be usable (ignoring virtual classes and all 
that), and that really is the case here.

The simplest solution would be to change the handler to not 
log the message.  Or log the message once per socket or 
something.