查看以下实现。我使用requests模块而不是进行urllib下载。而且，我使用.select()method.find_all()来避免使用re。
import os
import requests
from urllib.parse import urljoin
from bs4 import BeautifulSoup
url = "http://www.gatsby.ucl.ac.uk/teaching/courses/ml1-2016.html"
#If there is no such folder, the script will create one automatically
folder_location = r'E:\webscraping'
if not os.path.exists(folder_location):os.mkdir(folder_location)
response = requests.get(url)
soup= BeautifulSoup(response.text, "html.parser")
for link in soup.select("a[href$='.pdf']"):
#Name the pdf files using the last portion of each link which are unique in this case
filename = os.path.join(folder_location,link['href'].split('/')[-1])
with open(filename, 'wb') as f:
f.write(requests.get(urljoin(url,link['href'])).content)
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