题目内容（请给出正确答案）

[主观题]

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")

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更多“htmlText=''' ＜bookstore＞＜book…”相关的问题

第1题

htmlText=''' <bookstore> ...

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")

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第2题

from scrapy.selector import Selector htmlText=''' ...

from scrapy.selector import Selector 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) s=selector.xpath("//book/price") print(type(s),s) ____________________________________ print(type(s),s) s=selector.xpath("//book/price").extract_first() print(type(s),s) 程序结果： <class 'scrapy.selector.unified.selectorlist'> [ <selector xpath="//book/price" data="<price>29.99</price>"> , <selector xpath="//book/price" data="<price>39.95</price>"> ] <class 'list'> [' <price> 29.99 </price>', ' <price> 39.95 </price>'] <class 'str'> <price> 29.99 </price>

A、s=selector.xpath("/book/price").extract()

B、s=selector.xpath("/book//price").extract()

C、s=selector.xpath("//book//price").extract()

D、s=selector.xpath("//book/price").extract()

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第3题

from scrapy.selector import Selector htmlText=''' ...

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

A、s=selector.xpath("//book/title/text()")

B、s=selector.xpath("/book/title/text()")

C、s=selector.xpath("//book/title/text")

D、s=selector.xpath("/book/title/text")

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第4题

from scrapy.selector import Selector htmlText=''' ...

A、s=selector.xpath("//book[position=1]/title"); s=selector.xpath("//book[position=2]/title")

B、s=selector.xpath("//book[position()=2]/title"); s=selector.xpath("//book[position()=1]/title")

C、s=selector.xpath("//book[position=2]/title"); s=selector.xpath("//book[position=1]/title")

D、s=selector.xpath("//book[position()=1]/title"); s=selector.xpath("//book[position()=2]/title")

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第5题

from scrapy.selector import Selector htmlText=''' ...

from scrapy.selector import Selector htmlText=''' <bookstore> <book> <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.extract()) 程序结果： [' <book id="b2"> \n <title lang="chinese">学习XML</title>\n <price> 39.95 </price>\n </book>']

A、s=selector.xpath("//title[@lang='chinese']/parent:*")

B、s=selector.xpath("//title[lang='chinese']/parent::*")

C、s=selector.xpath("//title[@lang='chinese']/parent::*")

D、s=selector.xpath("//title[lang='chinese']/parent:*")

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第6题

from bs4 import BeautifulSoup doc=''' <title>The Dormouse's story</title>

The Dormouse's story

</book></book></book></book></book></bookstore></selector></selector></selector></selector></selector></selector></class></class></selector></selector></class></selector></selector></selector></selector></bookstore></body></html></title></generator></selector></selector></selector></selector></bookstore></body></html></title></book></bookstore></body></html>

Once upon a time there were three little sisters; and their names were Elsie, Lacie and Tillie; and they lived at the bottom of a well.

...

''' soup=BeautifulSoup(doc,"lxml") ___________________________________ for tag in tags: print(tag) 查找文档中class="sister"的元素,缺失语句是：

A、tags=soup.find(name=None,attrs={"class":"sister"})

B、tags=soup.find(attrs={"class":"sister"})

C、tags=soup.find_all(attrs={"class":"sister"})

D、tags=soup.find_all(name=None,attrs={"class":"sister"})

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第7题

selector.xpath("//bookstore/book") 搜索 <bookstore> 下一级的 <book> 元素，找到2个；

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第8题

A．Return his literature books to the bookstore.

B．Keep his books from the literature class.

C．Sell his literature books to the woman.

D．Visit the reference section of the library.

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第9题

A．Bookstores are keeping their promises.

B．Diet books are not always effective.

C．Diet books are usually helpful.

D．There are lots of ways of losing weight.

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第10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。

查询Book表中的图书类别(BookSort)，要求每个类别只显示一次。SQL语句：

SELECT _________ BookSort FROM Book

：A、DISTINCT

B、ONLY

C、ONE

D、PERCENT

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

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