class Tokidate(object):
    class _property(object):
        def __get__(self, inst, cls): print 'prop.__get__(%r,%r)' % (inst, cls); return 42
        def __set__(self, name, value): print 'prop.__set__(%r,%r)' % (name, value)
    toki = _property()

class BTClass(type):
    def __setattr__(self, attr, value):
        if attr == 'toki':
            print "cls.__setattr__(%r,%r)" % (attr, value)
        else:
            type(Tokidate).__setattr__(self, attr, value)

Tokidate = BTClass('Tokidate', Tokidate.__bases__, dict(Tokidate.__dict__))