Scrape the absolute URL instead of a relative path in python

问题

I'm trying to get all the href's from a HTML code and store it in a list for future processing such as this:

Example URL: www.example-page-xl.com

 <body>
    <section>
    <a href="/helloworld/index.php"> Hello World </a>
    </section>
 </body>

I'm using the following code to list the href's:

import bs4 as bs4
import urllib.request

sauce = urllib.request.urlopen('https:www.example-page-xl.com').read()
soup = bs.BeautifulSoup(sauce,'lxml')

section = soup.section

for url in section.find_all('a'):
    print(url.get('href'))

However I would like to store the URL as: www.example-page-xl.com/helloworld/index.php and not just the relative path which is /helloworld/index.php

Appending/joining the URL with the relative path isn't required since the dynamic links may vary when I join the URL and the relative path.

In a nutshell I would like to scrape the absolute URL and not relative paths alone (and without joining)

回答1:

In this case urlparse.urljoin helps you. You should modify your code like this-

import bs4 as bs4
import urllib.request
from urlparse import  urljoin

web_url = 'https:www.example-page-xl.com'
sauce = urllib.request.urlopen(web_url).read()
soup = bs.BeautifulSoup(sauce,'lxml')

section = soup.section

for url in section.find_all('a'):
    print urljoin(web_url,url.get('href'))

here urljoin manage absolute and relative paths.

回答2:

urllib.parse.urljoin() might help. It does a join, but it is smart about it and handles both relative and absolute paths. Note this is python 3 code.

>>> import urllib.parse
>>> base = 'https://www.example-page-xl.com'

>>> urllib.parse.urljoin(base, '/helloworld/index.php') 
'https://www.example-page-xl.com/helloworld/index.php'

>>> urllib.parse.urljoin(base, 'https://www.example-page-xl.com/helloworld/index.php')
'https://www.example-page-xl.com/helloworld/index.php'

来源：https://stackoverflow.com/questions/44001007/scrape-the-absolute-url-instead-of-a-relative-path-in-python

标签

python

beautifulsoup

mechanize