如何使用 Python 和 lxml 解析本地 html 文件？

Question

我正在使用 python 中的本地 html 文件，并且我正在尝试使用 lxml 来解析该文件。 出于某种原因，我无法正确加载文件，我不确定这是否与我的本地机器上没有设置 http 服务器、etree 使用或其他原因有关。

我对此代码的参考是： http : //docs.python-guide.org/en/latest/scenarios/scrape/

这可能是一个相关的问题： Requests : No connection adapters were found for, error in Python3

这是我的代码：

from lxml import html
import requests

page = requests.get('C:\Users\...\sites\site_1.html')
tree = html.fromstring(page.text)

test = tree.xpath('//html/body/form/div[3]/div[3]/div[2]/div[2]/div/div[2]/div[2]/p[1]/strong/text()')

print test

我得到的回溯如下：

C:\Python27\python.exe "C:/Users/.../extract_html/extract.py"
Traceback (most recent call last):
  File "C:/Users/.../extract_html/extract.py", line 4, in <module>
    page = requests.get('C:\Users\...\sites\site_1.html')
  File "C:\Python27\lib\site-packages\requests\api.py", line 69, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python27\lib\site-packages\requests\api.py", line 50, in request
    response = session.request(method=method, url=url, **kwargs)
  File "C:\Python27\lib\site-packages\requests\sessions.py", line 465, in request
    resp = self.send(prep, **send_kwargs)
  File "C:\Python27\lib\site-packages\requests\sessions.py", line 567, in send
    adapter = self.get_adapter(url=request.url)
  File "C:\Python27\lib\site-packages\requests\sessions.py", line 641, in get_adapter
    raise InvalidSchema("No connection adapters were found for '%s'" % url)
requests.exceptions.InvalidSchema: No connection adapters were found for 'C:\Users\...\sites\site_1.html'

Process finished with exit code 1

您可以看到它与“连接适配器”有关，但我不确定这意味着什么。

Answer 1

如果文件是本地文件，则不应使用requests ——只需打开文件并读入即可。 requests需要与 Web 服务器通信。

with open(r'C:\Users\...site_1.html', "r") as f:
    page = f.read()
tree = html.fromstring(page)

Answer 2

有一个更好的方法：使用parse函数而不是fromstring

tree = html.parse("C:\Users\...site_1.html")
print(html.tostring(tree))

Answer 3

您也可以尝试使用美汤

from bs4 import BeautifulSoup
f = open("filepath", encoding="utf8")     
soup = BeautifulSoup(f)
f.close()