【单选题】from scrapy.selector import Selector htmlText=''' Harry Potter 29.99 学习 XML 39.95 ''' selector=Selector(text=htmlText) ____________________________________ print(s.extract_first()) ___________________...
A.
s=selector.xpath("//book[position=1]/title"); s=selector.xpath("//book[position=2]/title")
B.
s=selector.xpath("//book[position()=1]/title"); s=selector.xpath("//book[position()=2]/title")
C.
s=selector.xpath("//book[position()=2]/title"); s=selector.xpath("//book[position()=1]/title")
D.
s=selector.xpath("//book[position=2]/title"); s=selector.xpath("//book[position=1]/title")
【单选题】from scrapy.selector import Selector htmlText=''' H arry P otter 29.99 ''' selector=Selector(text=htmlText) _________________________ print(s) print(s.extract()) for e in s: print(e.extract()) 程序结果: [...
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()")
【简答题】压缩系数 的下标a1-2的含义是 ( )。
(1)1表示自重应力,2表示附加应力; (2)压应力从1MPa增加到2MPa
(3)压应力从lOOkPa增加到200kPa; (4)无特定含义,仅是个符号而已 (7.5分)A. 1表示自重应力,2表示附加应力 B. 压应力从1MPa增加到2MPa C. 压应力从100kPa增加到200kPa D. 无特定含义,仅是个符号而已
【单选题】CSS selector types do not include which of the following options:
【单选题】from scrapy.selector import Selector htmlText=''' Harry Potter 29.99 学习 XML 39.95 ''' selector=Selector(text=htmlText) ____________________________________________________ print(s.extract_first()) s=s...
A.
s=selector.xpath("//book/title[@lang='chinese']/text")
B.
s=selector.xpath("//book/title[lang='chinese']/text")
C.
s=selector.xpath("//book/title[@lang='chinese']/text")
D.
s=selector.xpath("//book/title[@lang='chinese']/text()")
【单选题】我们要在传承与创新中树立和坚持正确的( )、民族观、国家观、文化观,增强做中国人的骨气和底气。
【简答题】故修礼者王,为政者强, ,聚敛者亡。 ——《荀子•王制》
【单选题】from scrapy.selector import Selector htmlText=''' Harry Potter 29.99 学习 XML 39.95 ''' selector=Selector(text=htmlText) _____________________________________ print(s) print(s.extract()) for e in s: pri...
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")
【简答题】翻译“故修礼者王,为政者强,取民者安,聚敛者亡。故王者富民,霸者富士,仅存之国富大夫,富筐箧,实府库。筐箧已富,府库已实,而百姓贫;夫是之谓上溢而下漏。入不可以守,出不可以战,则倾复灭亡可立而待也。”