[quote]The idea behind that class is to act "as-if" it were a real dictionary. Dicts have an update method, and UserDict should too. But it's not listed in the book (should appear a few lines below that code); this is a possible implementation: def update(self, other): for key in other.keys(): self.data[key] = other[key] Given this method, __init__ works fine. Using self.data.update(dict) is OK if the dict argument is a real dictionary, but not if it's another UserDict.[/quote] Thank you. But I'm still confused that what's the "real dictionary"?I can't know this point.Please help and thanks again.
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