django 中优雅的使用 choice 字段

问题

django中如何比较优雅的对元组进行标记分类。可使用choice字段

choice字段

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# models.py
class BookTagNum(object):
    OTHER = 1
    SCIENCE = 2
    SOCIAL_SCIENCES = 3
    ECONOMIC = 4
    COMPUTER = 5

class BOOK(models.Model):
    TAG_NUM_CHOICE = (
        (BookTagNum.OTHER, '其它'),
        (BookTagNum.SCIENCE, '科学类'),
        (BookTagNum.SOCIAL_SCIENCES, '社科类'),
        (BookTagNum.ECONOMIC, '经济类'),
        (BookTagNum.COMPUTER, '计算机类'),
    )
    tag = models.IntegerField(choices=TAG_NUM_CHOICE)

在代码中尽量不要出现固定的硬编码，比如某个判断条件，判断书的分类为：

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#view.py
def get(self, request):
	book = Book.obejects.filter(tag = BookTagNum.COMPUTER)