为什么用BeautifulSoup提取xml的link标签中的url总为空呢

废话少说
闲言少叙,直接上代码:
#!/usr/bin/env python3
# coding=utf-8
import requests
from bs4 import BeautifulSoup
def get_soup():
url = 'https://www.solidot.org/index.rss'
rss_xml = requests.get(url).text
soup = BeautifulSoup(rss_xml, 'html5lib')
return soup
def get_mail_body():
contents = get_soup().select('item')[0:9]
contents_list = []
for c in contents:
title = c.select_one('title').get_text()
link = c.select_one('link').get_text()
contents_list.app
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