Comparison function as class method: how?

[Jeff Stewart]

I was writing a small class yesterday that maintains a list of file
statistics.  I want this class to have a sortByModTime() method, but I
couldn't get Python to accept a sort()-compatible comparison function as a
class method.  It kept telling me that the function expected 'self' as the
first argument.  I understand that all class methods have this requirement,
but surely there's a way to encapsulate a comparison function in the class
containing the data it sorts!

Is there a way to pull this off?

--
Jeff S.