django Meta属性

            model的元类信息：
                 Book._meta.verbose_name
                 '书籍'
                 Book
                 <class 'app01.models.Book'>
                 Book._meta.model_name
                 'book'
                 Book._meta.app_label
                 'app01'
                class Book(models.Model):
                    title=models.CharField(max_length=32,verbose_name="书籍名称")


                     def __str__(self):
                        return self.title
                     class Meta:
                            app_label="APP01"
                            db_table="app01book"
                            unique_together=["title","price"]
                            verbose_name="书籍"