对于我的课程,我必须构建一个网络抓取工具,该抓取工具将img,word docs和pdf放到网站上并将其下载到文件中,我得到了img下载工作,但是当我更改代码以下载docs或pdf时,根本找不到任何东西,我使用beautifulsoup抓取了网站,而且我知道网站上有docs和pdf只是无法下载。
from bs4 import BeautifulSoup
import urllib.request
import shutil
import requests
from urllib.parse import urljoin
import sys
import time
import os
import url
import hashlib
import re
url = 'http://www.soc.napier.ac.uk/~40009856/CW/'
path=('c:\\temp\\')
def ensure_dir(path):
directory = os.path.dirname(path)
if not os.path.exists(path):
os.makedirs(directory)
return path
os.chdir(ensure_dir(path))
def webget(url):
response = requests.get(url)
html = response.content
return html
def get_docs(url):
soup = make_soup(url)
docutments = [docs for docs in soup.findAll('doc')]
print (str(len(docutments)) + " docutments found.")
print('Downloading docutments to current working directory.')
docutments_links = [each.get('src') for each in docutments]
for each in docutments_links:
try:
filename = each.strip().split('/')[-1].strip()
src = urljoin(url, each)
print ('Getting: ' + filename)
response = requests.get(src, stream=True)
# delay to avoid corrupted previews
time.sleep(1)
with open(filename, 'wb') as out_file:
shutil.copyfileobj(response.raw, out_file)
except:
print(' An error occured. Continuing.')
print ('Done.')
if __name__ == '__main__':
get_docs(url)
答案 0 :(得分:0)
首先,您应该阅读.find_all()和其他方法的作用:.find_all()
.find_all()的第一个参数是标记名称。
还可以
<img src='some_url'>
标签。您通过汤.find_all('img')获得了所有img标签,将所有URL提取到实际文件中并下载了它们。
现在您正在寻找
之类的标签
<a href='some_url'></a>
,其网址包含“ .doc”。这样的事情应该做到:
soup.select('a[href*=".doc"]')
答案 1 :(得分:0)
更多,但您可以使用OR CSS选择器语法来组合pdf,docx等。请注意,您仍然需要完成一些路径,例如加上前缀"http://www.soc.napier.ac.uk/~40009856/CW/"
。以下将attribute = value css选择器语法与$运算符结合使用(这意味着属性字符串的值以结尾)
from bs4 import BeautifulSoup
import requests
url= 'http://www.soc.napier.ac.uk/~40009856/CW/'
res = requests.get(url)
soup = BeautifulSoup(res.content, 'lxml')
items = soup.select("[href$='.docx'], [href$='.pdf'], img[src]")
print([item['href'] if 'href' in item.attrs.keys() else item['src'] for item in items])