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I'm going to reject this bug as "won't fix".  I specifically
put code in the new classes to create this behavior.  It's
partly a
performance hack: many operations become much slower if they
have to
check the instance __dict__ first.  But I also believe it's
poor
style to override a system operation on the instance rather
than on
the class.  If you want to be able to override behavior per
instance,
use this:

  class A(object):
    def __repr__(self):
      return self.repr()
    def repr(self):
      return 'abc'

  a = A()
  a.repr = lambda: '123'
  assert repr(a) == a.__repr__() == '123'