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dispatcher is not at all unusable without subclassing.  You 
can get data with recv() and send it with send() etc.  It can be 
treated as a thin wrapper around socket objects.  Yes, you 
will want to subclass it to get more useful behaviour than you 
can get from a basic socket.  I don't see that this means that 
you should be required to override the handle_expt() function, 
though.  As much as possible a class should provide 
sensible methods, so that overriding is kept to a minimum.

At the very least, this is a documentation error, since the 
documentation states:

"""
handle_expt( ) 

Called when there is out of band (OOB) data for a socket 
connection. This will almost never happen, as OOB is 
tenuously supported and rarely used. 
"""

"Almost never" is completely wrong.