Question

我有一个小脚本，使用urllib2获取网站内容，找到所有链接标记，在顶部和底部附加一小段HTML，然后我尝试美化它。它一直返回TypeError：序列项1：期望的字符串，Tag found。我环顾四周，我找不到问题。一如往常，任何帮助，非常感谢。

import urllib2
from BeautifulSoup import BeautifulSoup
import re

reddit = 'http://www.reddit.com'
pre = '<html><head><title>Page title</title></head>'
post = '</html>'
site = urllib2.urlopen(reddit)
html=site.read()
soup = BeautifulSoup(html)
tags = soup.findAll('a')
tags.insert(0,pre)
tags.append(post)
soup1 = BeautifulSoup(''.join(tags))
print soup1.prettify()

这是回溯：

Traceback (most recent call last): File "C:\Python26\bea.py", line 21, in <module>
        soup1 = BeautifulSoup(''.join(tags))
TypeError: sequence item 1: expected string, Tag found

Answer 1

这对我有用：

soup1 = BeautifulSoup(''.join(str(t) for t in tags))

这种pyparsing解决方案也提供了一些不错的输出：

from pyparsing import makeHTMLTags, originalTextFor, SkipTo, Combine

# makeHTMLTags defines HTML tag patterns for given tag string
aTag,aEnd = makeHTMLTags("A")

# makeHTMLTags by default returns a structure containing
# the tag's attributes - we just want the original input text
aTag = originalTextFor(aTag)
aEnd = originalTextFor(aEnd)

# define an expression for a full link, and use a parse action to
# combine the returned tokens into a single string
aLink = aTag + SkipTo(aEnd) + aEnd
aLink.setParseAction(lambda tokens : ''.join(tokens))

# extract links from the input html
links = aLink.searchString(html)

# build list of strings for output
out = []
out.append(pre)
out.extend(['  '+lnk[0] for lnk in links])
out.append(post)

print '\n'.join(out)

打印：

<html><head><title>Page title</title></head>
  <a href="http://www.reddit.com/r/pics/" >pics</a>
  <a href="http://www.reddit.com/r/reddit.com/" >reddit.com</a>
  <a href="http://www.reddit.com/r/politics/" >politics</a>
  <a href="http://www.reddit.com/r/funny/" >funny</a>
  <a href="http://www.reddit.com/r/AskReddit/" >AskReddit</a>
  <a href="http://www.reddit.com/r/WTF/" >WTF</a>
  .
  .
  .
  <a href="http://reddit.com/help/privacypolicy" >Privacy Policy</a>
  <a href="#" onclick="return hidecover(this)">close this window</a>
  <a href="http://www.reddit.com/feedback" >volunteer to translate</a>
  <a href="#" onclick="return hidecover(this)">close this window</a>
</html>

Answer 2

soup1 = BeautifulSoup(''.join(unicode(tag) for tag in tags))

Answer 3

Jonathans的一些语法错误回答，这是正确的：

    soup1 = BeautifulSoup(''.join([unicode(tag) for tag in tags]))

无法在BeautifulSoup中美化刮掉的HTML

3 个答案: