htmlText=''' ＜bookstore＞＜book id="b1"&...

htmlText=''' ＜bookstore＞＜book id="b1"＞＜title lang="english"＞Harry Potter＜/title＞＜price＞29.99＜/price＞＜/book＞＜book id="b2"＞＜title lang="chinese"＞学习XML＜/title＞＜price＞39.95＜/price＞＜/book＞＜/bookstore＞ ''' selector=Selector(text=htmlText) _________________________________________ print(s) print(s.extract()) for e in s: print(e.extract()) 程序结果： [＜selector xpath="//book/@id" data="b1"＞, ＜selector xpath="//book/@id" data="b2"＞] ['b1', 'b2'] b1 b2

A、s=selector.xpath("/book/@id")

B、s=selector.xpath("//book/@id")

C、s=selector.xpath("//book/id")

D、s=selector.xpath("/book/id")

提问人：网友polarbear627 发布时间：2022-01-07

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第1题

BookStore数据库中有图书表Book(BookCode, BookName, Author, PublisherCode, PublishTime，BookSort, ISBN, BookPicture, ContentInro, Price, Discount)，其中 PublishTime是datetime类型。显示图书的最高价、最低价、平均价、最高价与最低价之间的差值。SQL语句： SELECT MAX(Price) As 最高价, MIN(Price) As 最低价, Str(AVG(Price),6,2) As 平均价, ________ As 最高价与最低价的差值 From Book

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第2题

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第3题

from scrapy.selector import Selector htmlText=''' <bookstore> <book id="b1"> <title lang="english">HarryPotter</title> <price>29.99</price> </book> </bookstore> ''' selector=Selector(text=htmlText) _________________________ print(s) print(s.extract()) for e in s: print(e.extract()) 程序结果： [<selector xpath="//book/title/text()" data="arry ">, <selector xpath="//book/title/text()" data="otter">] ['arry ', 'otter'] arry otter

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