for a in soup.find_all('a', href=True):
    print "Found the URL:", a['href']

from bs4 import BeautifulSoup
import requests
import re
url = requests.get("https://8ch.net/a/res/869528.html")
soup = BeautifulSoup(url.text,"html.parser")
print soup
for a in soup.find_all(re.compile('([-w]+.(?:jpg|jpeg|png))') ):#'a', href=True):
    print "Found the URL:", a #['href']