Python 通过 xml 抓取打印空括号

Question

我正在尝试通过 lxml 从网站中提取几个字符，然后是树，然后是 xpath。我试过使用谷歌浏览器来获取正确的 xpath，但它打印出空括号。

    #imports
    from lxml import html
    import requests

    #get magicseaweed Scripps report
    msScrippsPage = requests.get("""http://magicseaweed.com/Scripps-Pier-
    La-Jolla-Surf-Report/296/.html""")

    #make tree from site
    msScrippsTree = html.fromstring(msScrippsPage.content)

    #get wave size
    msScrippsWave = msScrippsTree.xpath("""/html/body/div[2]/div[5]/div/div[1]/div[2]/div[2]/div/div[2]/div[1]/div/div[1]/div/div/div/div/div[1]/div/div[2]/ul[1]/li[1]/text()""")

    print 'ms SCripps: ', msScrippsWave

终端的输出是'msScripps: [ ]'

Answer 1

您不应该在您的网址中使用换行符。当您使用一行时，您的 xpath 工作。

msScrippsPage = requests.get("""http://magicseaweed.com/Scripps-Pier-La-Jolla-Surf-Report/296/.html""")
print msScrippsPage.content
['    0.4-0.6', '   ']
########################################
url = """http://magicseaweed.com/Scripps-Pier-
La-Jolla-Surf-Report/296/.html"""
print url
'http://magicseaweed.com/Scripps-Pier-\n    La-Jolla-Surf-Report/296/.html'

编辑:添加完整示例

from lxml import html
import requests

msScrippsPage = requests.get("""http://magicseaweed.com/Scripps-Pier-La-Jolla-Surf-Report/296/.html""")
msScrippsTree = html.fromstring(msScrippsPage.content)
msScrippsWave = msScrippsTree.xpath("""/html/body/div[2]/div[5]/div/div[1]/div[2]/div[2]/div/div[2]/div[1]/div/div[1]/div/div/div/div/div[1]/div/div[2]/ul[1]/li[1]/text()""")
print 'ms SCripps: ', msScrippsWave