TypeError: expected string or buffer问题，大侠帮忙看看

Question

import urlparse,urllib2,re

def download(url,num_retries=2):

    print 'Downloading:',url

    try:

        html=urllib2.urlopen(url).read()

    except urllib2.URLError as e:

        print 'Download error:',e.reason

        html=None

        if num_retries>0:

            if hasattr(e,'code') and 500<=e.code<600:

                return download(url,num_retries-1)

            return html

        

def get_links(html):

    webpage_regex=re.compile(r'<a[^>]+href=["\'](.*?)["\']',re.IGNORECASE)

    return webpage_regex.findall(html)

def link_crawler(seed_url,link_regex):

    crawl_queue=[seed_url]

    while crawl_queue:

        url=crawl_queue.pop()

        html=download(url)

        for link in get_links(html):

            if re.match(link_regex,link):

                link=urlparse.urljoin(seed_url,link)

                crawl_queue.append(link)

运行link_crawler('http://example.webscraping.com/','/(index|view)')

Downloading: http://example.webscraping.com/

Traceback (most recent call last):

  File "<pyshell#12>", line 1, in <module>

    link_crawler('http://example.webscraping.com/','/(index|view)')

  File "C:/Python27/lianxi/pachong4.py", line 23, in link_crawler

    for link in get_links(html):

  File "C:/Python27/lianxi/pachong4.py", line 16, in get_links

    return webpage_regex.findall(html)

TypeError: expected string or buffer

什么问题呀？！！小白

Answer 1

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

Answer 2

nazhongyuyan

Answer 3

python？