抓取网页里的链接地址

我试图抓取上图的链接可是返回以下错误

Traceback (most recent call last):
File "/Users/euro3/Library/Preferences/PyCharmCE2018.1/scratches/scratch_7.py", line 65, in
add_index_url(url,num,file_object)
File "/Users/euro3/Library/Preferences/PyCharmCE2018.1/scratches/scratch_7.py", line 51, in add_index_url
write_url=get_download_url(html)
File "/Users/euro3/Library/Preferences/PyCharmCE2018.1/scratches/scratch_7.py", line 14, in get_download_url
url_a=td.find('source')
AttributeError: 'NoneType' object has no attribute 'find'

下面是我运行的代码：

import sys
import urllib2
import os
import chardet
from bs4 import BeautifulSoup
import time
reload(sys)
sys.setdefaultencoding("utf-8")

def get_download_url(broken_html):
    soup=BeautifulSoup(broken_html,'html.parser')
    fixed_html=soup.prettify()
    td=soup.find('video',attrs={'id':'player_html5_api'})
    url_a=td.find('source')
    url_a=url_a['src']
    return url_a

def get_title(broken_html):
    soup=BeautifulSoup(broken_html,'html.parser')
    fixed_html=soup.prettify()
    title=soup.find('h1')
    title=title.string
    return title

def url_open(url):
    req=urllib2.Request(url)
    req.add_header('User-Agent','Mozilla/5.0')
    response=urllib2.urlopen(url)
    html=response.read()
    return html

def add_index_url(url,num,file_object):
    for i in range(1,num):
        new_url=url+str(i)
        print("----------------------start scraping page"+str(i)+"---------------------")
        html=url_open(new_url)
        time.sleep(1)
        soup=BeautifulSoup(html,'html.parser')
        fixed_html=soup.prettify()
        a_urls=soup.find_all('div',attrs={'class':'pic'})
        host="http://zhs.lxxlxx.com"
        for a_url in a_urls:
            a_url=a_url.find('a')
            a_url=a_url.get('href')
            a_url=host+a_url
            print(a_url)
            html=url_open(a_url)
            #html=unicode(html,'GBK').encode("utf-8")
            html=html.decode('utf-8')
            write_title=get_title(html)
            write_url=get_download_url(html)
            file_object.write(write_title+"\n")
            file_object.write(write_url+"\n")

if __name__=='__main__':
    url="http://zhs.lxxlxx.com/new/"
    filename="down_load_url.txt"
    num=int(raw_input("please input the page num you want to download:"))
    num=num+1
    if os.path.exists(filename):
        file_object=open(filename,'w+')
    else:
        os.mknod(filename)
        file_object=open(filename,'w+')
    add_index_url(url,num,file_object)
    print("----------------------scraping finish--------------------------")
    file_object.close()

有谁可以帮忙修改一下，本人自学python中所以不是很明白哪里出错

有可能是soup没有查到video标签，然后返回了None给td，建议你在执行soup.find后判断返回值有没有数据

修改下个函数，然后在打印结果里查看是否能找到td的结果，然后再查看td的结果是否和有source结果

def get_download_url(broken_html):
    soup=BeautifulSoup(broken_html,'html.parser')
        print (soup)
    fixed_html=soup.prettify()
    td=soup.find('video',attrs={'id':'player_html5_api'})
        print (td)
    url_a=td.find('source')
    url_a=url_a['src']
    return url_a