property代替setter和getter

Book:    (, name, price):        ._name = name        ._price = price    name():        ._name    name(, name):        ._name = name    price():        ._price    price(, price):        price > :            ._price = price        :            ()book = Book(, )(book.name)(book.price)book.price = (book.price)
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