xpath
xpath常用規則
text = '''
'''
from lxml import etree
selector = etree.html(text)
result = selector.xpath('//*')
print(result)
[, , , , , , , , , , , , , ]from lxml import etree
selector = etree.html(text)
result = selector.xpath('//li/a')
print(result)
[, , , , ]from lxml import etree
selector = etree.html(text)
result = selector.xpath('//li/..')
print(result)
from lxml import etree
selector = etree.html(text)
result = selector.xpath('//li[@class="item-0"]')
print(result)
[, ]from lxml import etree
selector = etree.html(text)
result1 = selector.xpath('//li[@class="item-0"]/text()')
result2 = selector.xpath('//li[@class="item-0"]/a/text()')
print(result1)
print(result2)
['\n ']
['first item', 'fifth item']
from lxml import etree
selector = etree.html(text)
result = selector.xpath('//li[@class="item-0"]/a/@href')
print(result)
['link1.html', 'link5.html']from lxml import etree
text1 = '''
first item
'''selector = etree.html(text1)
result1 = selector.xpath('//li[@calss="li"]/a/text()')
result2 = selector.xpath('//li[contains(@class,"li")]/a/text()')
print(result1)
print(result2)
['first item']
from lxml import etree
text2 = '''
first item
'''selector = etree.html(text2)
result = selector.xpath('//li[contains(@class,"li") and @name="item"]/a/text()')
print(result
['first item']from lxml import etree
text = '''
'''selector = etree.html(text)
result1 = selector.xpath('//li[1]/a/text()')
print(result1)
result2 = selector.xpath('//li[last()]/a/text()')
print(result2)
result3 = selector.xpath('//li[position()<3]/a/text()')
print(result3)
result4 = selector.xpath('//li[last()-2]/a/text()')
print(result4)
['first item']
['fifth item']
['first item', 'second item']
['third item']
from lxml import etree
text3 = '''
'''selector = etree.html(text3)
result1 = selector.xpath('//li[1]/ancestor::*')
print(result1)
result2 = selector.xpath('//li[1]/ancestor::div')
print(result2)
result3 = selector.xpath('//li[1]/attribute::*')
print(result3)
result4 = selector.xpath('//child::a[@href="link1.html"]')
print(result4)
result5 = selector.xpath('//li[1]/descendant::span')
print(result5)
result6 = selector.xpath('//li[1]/following::*[2]')
print(result6)
result7 = selector.xpath('//li[1]/following-sibling::*')
print(result7)
[, , , ]
['item-0']
[, , , ]
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