What’s New In Python 3.4(docs.python.org)

    class HandleA:
        def handle(self):
            pass

    class HandleB:
        def handle(self):
            pass

    def main(obj):
        # obj could be instance of HandleA or HandleB
        obj.handle()

    from functools import singledispatch

    @singledispatch
    def handle(obj):
        pass
    
    @handle.register(A)
    def handle_A(obj):
        pass

    @handle.register(B)
    def handle_B(obj):
        pass

    def main(obj):
        # obj could be instance of A or B
        handle(obj)

    import readline
    import rlcompleter
    readline.parse_and_bind('tab: complete')