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Sorry, but maybe I could just interject here. Walter's sub-
classing example works fine, except for the fact that if the 
string is short enough, it gets handled slightly differently and 
the format() override gets bypassed.  I worked around this by 
shortening the width, but I've found that this screws with a lot 
of the nice formatting of other structures, and so basically 
creates a new set of problems.  If the "format() bypass" 
limitation can be removed, I think it would allow for more 
reliable extensibility by subclassing PrettyPrinter.