Python-сообщество

class myDict(dict):
        def update(self, *args):
                super(myDict, self).update(self, *args)
                return self

boo = myDict()
boo = {'a': 1, 'b': 2}
s = boo.update({'c': 3})
print s

boo = {'a': 1, 'b': 2}